Malicious PDF — malware analysis report

Static analysis result for SHA-256 443e220e1e4a6329…

MALICIOUS

PDF

86.0 KB Created: 2021-07-31 08:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4763adfaa6a14ae87309ddc527b70f33 SHA-1: 3ed91827ff04cd191f32a56d56dd179f96a543ed SHA-256: 443e220e1e4a6329357e623fe2318fb7eed52c8526c2267248b5a9e598bdedef
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, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted from this sample, but the structure and URL analysis strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://alexhofford.com/temp/files/file/60702405246.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bd8942d7---57448530606.pdfIn PDF document text
    • http://sartor.ru/upload/files/44330802015.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/2714787930.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/34687b522263ec360a85c6c59e68f8b5/60559536831.pdfIn PDF document text
    • https://csn-alliance.com/data/files/vupimimajewozekegu.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/30916121865.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b6b53defa816011cda99e1d279b9f67f/mafurawabev.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/14086374491.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ab5093a12---xugadibafazadi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9ca794bb---74276053902.pdfIn PDF document text
    • http://texmet.pl/userimages/file/64265249925.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e486a1156f5---luzuvevi.pdfIn PDF document text
    • http://dogable.de/userfiles/file/zopexamexotunuvepor.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/482806250.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e962883ba---guvimud.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a3b207451---42272363308.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/43gh8gite4mkl0hhovgoug01vj/subigivobikobarof.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b5278fe8fd2---sasikogadasozegejesin.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4335c4da1---faxawodizigexabo.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/60365228623.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/kulilemabovekesijinofi.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/fixiwijezopefezoxajaxave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=army+of+darkness+defense+2+mod+apk+revdlPDF 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_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 17576 bytes
SHA-256: 3690cfa79740012d2e62d1ebc4d454890727a530370e36d364a779c78b815dcb
font_02_sfnt_off000130f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F8 10844 bytes
SHA-256: 3261e2f0c2c15b242df718ac339c33252c4f3ad7d78f93d266c187e96ccbf679

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