Malicious PDF — malware analysis report

Static analysis result for SHA-256 608946ed8e1c918d…

MALICIOUS

PDF

94.2 KB Created: 2021-09-02 05:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c3fe47efca158dd3e4b31165ef1a7bfe SHA-1: 98e6bb4747c6fca427f11ff464ce172d032b88aa SHA-256: 608946ed8e1c918d09a52869f923003d4016f6c0f8c43292033df353cb4f0ef2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://riwg.in/userfiles/file/gevijesapunajotawor.pdf In PDF document text
    • http://vhktn.at/images/content/files/zokimebakupivuluja.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610039d32ccb3---vizorekura.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0102c8905---20584837550.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/skra06fd2jfnjdrd4kg61519m3/72250811060.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/lozepabijiwetide.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/32256095903.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5aa8db38---mejili.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1611e397819a2d---30374686473.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/kuvuhli89qaalfelm62l1c2cf7/lalolaxetabuzisuvezopegug.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/bovaxedumajof.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/fevenokigopurake.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fa7fb8e9eba2f425ed7fa357d75423a5/51963767156.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7d292790fe197bee1541e34166758645/65550081446.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/39535634908.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611550aa90f2d---kireza.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gisepususu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6927163a9e25ebf7d48f52d658eab80d/30752119548.pdfIn PDF document text
    • http://polkovnik.su/upload/file/popafokemu.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/82305009962.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7b6f11cd---rejugatumiregelaruzigi.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/5b74570be6edaaa1152bd64a7f6c1ed9/15467617723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=radiopaque+lesion+at+apex+of+toothPDF 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_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 10888 bytes
SHA-256: 88ba71b7e18966c3c5172bebceb851d951f1cc39db3428b608f517dba443dd04
font_01_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 17372 bytes
SHA-256: 1aa4c0fe182c123674ea45205948313d2744ae119b0cfcac86d7fe5ba8d450a3
font_02_sfnt_off000151d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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