Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d204d22658d47a…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 16:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22e399e44ae297f5830d1835542c65ac SHA-1: 4b921450b525a9bd619dc2a424dd91ae530cf7c1 SHA-256: b2d204d22658d47aefa6cf38e02ef1c7c316e9505a48a9e1698fa6348d84cf52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were extracted, the PDF structure and numerous embedded URLs indicate it's designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3222c881---36863880218.pdf In PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/5828653608.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/tonefegozilamax.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/14250222192.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/kewosederaxolaz.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d76a127b0---vewat.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/53794292192.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/mexibajagabejifegiwev.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcf294b826---42562058005.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4116e3909192f4c7fbb63d6b5cbc590a/nimibewudipitevoxuxe.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5c2a71309b87e5f11b9aa0c4d31e3c33/bomik.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/rinoxat.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607013aa69a1f---bimefirilogaganikaxini.pdfIn PDF document text
    • https://primer-spb.ru/files/files/lagirukakefuzadaju.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/jumurubabinozamup.pdfIn PDF document text
    • http://planetamama.ru/files/file/29191894453.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaff3009a---tenilobujuwifatido.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/46505907808.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/30606625758.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/78844246579.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/siwojosudi.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/1ilsncecgqtv63ra8msc920flr/sitosuwesisedoposorawas.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/28020253709.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e1a003e8935462e300dde604c0e38db6/wefajevawijolifovakuv.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/49429575125.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae2254525---jovasutinuxibobojetaxuv.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7d1581ce4---43420211047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=coby+under+cabinet+tv+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10816 bytes
SHA-256: 6cd6877ebba625c06ca9fb8f1178a9f1dd196f4b045cd8773ff5c00853ad9b3f
font_01_sfnt_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 16444 bytes
SHA-256: 96d95e135f07dd95772d5ba861f60da605aa3ad34053f79790826af81662271f
font_02_sfnt_off00013f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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