Malicious PDF — malware analysis report

Static analysis result for SHA-256 5616df338bc930f0…

MALICIOUS

PDF

118.2 KB Created: 2021-07-22 16:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 902ecb55fdea13487652a09bc7456218 SHA-1: a352c27d21fe168fde224b6747aa6e78554af726 SHA-256: 5616df338bc930f067cdb18f12882d51d40b85ffe035312c95aca8faac88683d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malicious files or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/62a8d6da42d5d391805d14620118c2bc/4280998753.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff466806f---tetifenebofewiwawozud.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/libukigoxukonoropu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/m9k9e2ben2s1s86mqrhu7piuj6/morej.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00eb2183d2---woburetos.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/jiwipoxeb.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ffaed840dbaaee3df31bbed49bdc89fe/rogorodumet.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec76d0ebe---jisedugefu.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/92856955231.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/tokewitavelezakoso.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9188d494bpsplq19220mi3f51b/vejoxopuworivir.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90184c6ace---24538573090.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608431d0c7745---18303140869.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b0435e841a31212fa4d40940a7d3fe16/21489470811.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb4db1b771---79427181754.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/05ef2a558c7607327d1534640ba4dc2e/97376005415.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/suxutirogak.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wavadulukewaxafaxudok.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607605ddc72c7---28318801272.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/5180507791.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1a29ea48---34885213604.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cb8c7a551---39343758281.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad193dfe9---56403815072.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/wipifabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+naruto+themesPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e2cdd919bfb3ad6ab93a8e7277607806/7681345010.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 28352 bytes
SHA-256: 48fc0f4b0e0dff7f2e4506214c30b843e8cd4e6b47b86508ddbe0a78d57986b5
font_01_sfnt_off00015412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15412 16568 bytes
SHA-256: 7f6419e62a620a07d91934a6b98331822cc3aa0431f5e5c63bb07278d2c726c6
font_02_sfnt_off00016b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18337 10388 bytes
SHA-256: 3e9bea65824d70ccd0cde1cafe7011afce8c1e82dd565c238dc0340668b8af39
font_04_sfnt_off00019a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A94 17828 bytes
SHA-256: 9f890616e0537fdcb3d9d4e287224343ffc05c9c2ca13a2e07b3f0211bcff573

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