Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa321c535d1e6c52…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 00:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63fc075ad26334415c5ded425b823248 SHA-1: 4fcbd5b3a00c6967d1657727e22188f6f5b44310 SHA-256: aa321c535d1e6c5280b8373b421f947a9fbbf989159c39d058e0942049716fe8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The document body was unreadable, but the heuristics strongly indicate a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c40f8081d---refunoruxud.pdf In PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082972c956f4---27201912470.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/78114494eb034b76b89f237751cbdf16/7297243529.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a300efe15---29931480036.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/velofesom.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ci8dk2jf7t938j0pkc0onul0gg/62947490399.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ef53a6bc---54614577686.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/42101884291.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084768ee1b98---70460900227.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/77701349788.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/16035280533.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfccdb38905---jojufazizusetopumonuvisu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d40c60f59---puvusazujavozu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/70a752f6e6f30629e6991e7c50f84b42/fuvokut.pdfIn PDF document text
    • https://bayramkaracabeton.com/images/Media/files/9264389654.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/susipenude.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/liweripuvi.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/38868015789.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jesazug.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd1c6567---vanafofumixevulowaralej.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/525eb9b9ab401dea37be9b4dc770a798/715758454.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/govakajogotutibamimofazub.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ca29a7dfff4aa91037c3ae4ae518eeb7/70038584961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=levels+of+ecological+organization+in+order+from+smallest+to+largestPDF 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_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 18784 bytes
SHA-256: 784b4b30cfd5921d6788a35ab71f9d29c5a759d0e9acc53a324b7b272a36a60f
font_01_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 10900 bytes
SHA-256: 8f824c17d08b87ef4b98fce98b821235c983b152afd53b5eebb1745f746e05ed
font_02_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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