Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ee7343860c2034…

MALICIOUS

PDF

93.6 KB Created: 2021-06-29 12:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c27023c72e10a8ca6165cadbe127cc6d SHA-1: 5a379fc72fdb525649e2e9d67da2a42b3ce7ae34 SHA-256: 84ee7343860c2034bc94f8a34cd0a35869d3299220ca2ceea54f439207d0c4b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and a link farm structure suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • 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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b0d1afcf---xerabobamojito.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fb33a75d2a2286ab834c134443cdec3d/53483601950.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a1166bde---dinatekufolabuga.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b478df4c---numisirefusakalal.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/tasiwavolizemabuxame.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/ferodebaniwo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b004c4e8303---zovifuteroxiruj.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/41020693883.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c230b4753---fupakupotovusebesa.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kasufozodij.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afd10e84590---pewaviwirex.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772c963732f---36317132958.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ca7b133j28a6ojhdc8964i607/22384826903.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607706bd9416c---96484615556.pdfIn PDF document text
    • https://eternalbliss.net/file/fujelu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/31d5e43ce7eecea2d9c740f9bac65400/89909707563.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/53862521883.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd4c6f21f9---zugojigopurojit.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0765670e---kiromerovi.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/zejer.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0833ea4c---70282949925.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9061d3b4a---buwetibivaxavazotevivur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=econometric+methods+with+applications+in+business+and+economics+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000132a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x132A5 17912 bytes
SHA-256: aa0ab57608301b89412d18fcb9d1c7d33ff35b3973a4150b99bee1ee3383ea9c
font_00_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 18236 bytes
SHA-256: d14ef1c40a8411c5b59467d45bec0813c60508384b69fc114d7fbb660952cfd3
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 11192 bytes
SHA-256: 9fcef6897244ad6bf108a07260f5b2abb235ce2e55024aa872208f088f93dc82

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