Malicious PDF — malware analysis report

Static analysis result for SHA-256 91284cd1684a2b0c…

MALICIOUS

PDF

98.7 KB Created: 2021-07-03 19:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d44f51143aecec1a45caa3c3f157aa69 SHA-1: a38aaf95b66d7d48167d8a35be4dc2d73f2b1958 SHA-256: 91284cd1684a2b0cece44230839ceeb89a6c25dfea393042ea5aa8667c562ceb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tefen67.com/userfiles/files/85828547084.pdf In PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/padiveditokesemabowiv.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d4c696e02ff377ff5220cd53d3b0c64e/mikovowuwukofevo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nigimipegigajajolo.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///tekobulo.pdfIn PDF document text
    • http://raczcsalad.hu/files/18403770362.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcb837ae18---47370963570.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c66b57cbf---duzigotopuworupidinok.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e34c30b0---24899487819.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/goxojufirawoga.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/6a47ad78a0a17d1b96ec0f16d7ed8c34/sovalufopivisorigif.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e59ea634---bolixoxorudij.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63bffcf30a---julutekepa.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d0ca89f6945f8828f5b8576ce63a345e/26671110066.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/sipexupofokabiwesetuwa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/abfefec9d41bd150812195534ffc204a/pikunosenuzowawi.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/274f606942001cc19000b9350ee9950e/dawilizawe.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/razowowuxexopidexilugolo.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d120300a1345339bdbc781bf4c71ea87/kezekuxadivevowekawu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a58142dabbf9f5f1c99648006406a5cc/xibovizemipuw.pdfIn PDF document text
    • http://katachizu.com/img/news/files/jumolukowagujidefi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a582e8e662359580d61f9324576e1d9f/60493057210.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/korin.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f8cd627f9---67731856915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=who+owns+american+eaglePDF 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
font_00_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 20680 bytes
SHA-256: d8944c5bad87651f6d368c66ee4eef8c215873457def5a7c5f06ddb943fcb574
font_02_sfnt_off0001541c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541C 4432 bytes
SHA-256: 72d3e1dbbb2f49fb2ad0ba850d655e6f59c495d6181ec263c017644de8744c4e
font_03_sfnt_off000164d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D9 10660 bytes
SHA-256: bdc837dd0e7301384ea6690d5fe9831e1ea42b0ccb9ed107bc5ace6ac1c3d194

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