Malicious PDF — malware analysis report

Static analysis result for SHA-256 2328af396b2130dc…

MALICIOUS

PDF

114.4 KB Created: 2021-09-01 05:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46a8dfe85d36c81d7413c59ed36db0be SHA-1: ce4c12c97b8f9b8627bb823f99eb31e14ed15a6b SHA-256: 2328af396b2130dcfe9d783408f045fc6ffdcce416d572a1348d1d197c5865c1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous unknown/compromised URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6669c99eb72628e243e11c2f023ca966/47236708309.pdf In PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/67269003794.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/tedelapodilakameforag.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/88834166922.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/rugaserelonapegedakako.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a88d987e904f67260bcdf718f913fcd9/malesefixov.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vadobetawabesoxote.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad80dead41---bopatipepibamiz.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/78547126761.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a49fcca9a5c065b14061e6443fe151ea/91866190290.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/60011534254.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/72050619217.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c06fa3a842b1ec187f1fc93c7cdc34ab/50620511956.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d0a6e14345e47c69ec82d2bd6e3fa6ea/madariloxodebazurokubejal.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e956870e8c---dabokipirurufugi.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/86870836439.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/xegizu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089866334f58---41852029818.pdfIn PDF document text
    • http://gz-gm.com/uploadfile/files/20210819_012057.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/90220458198.pdfIn PDF document text
    • http://svx.su/ffile/file/92044233800.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f81bf1149---5220477250.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d47ed383f7faa30f30416363034cc90d/rewiken.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/81da4a082c93c8f63156b87ea66df310/biwowitimuzalefano.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/sotadukufepujezakatid.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/456e397ab06d828f1e9646982c2fa29f/porelorowejotiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=profound+sorrow+meaningPDF 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_off00015af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17307 19000 bytes
SHA-256: b761f422db7f643d6bf2597f33b0b614da8d5c576a8828cc6c2d818f1fbdac19
font_02_sfnt_off0001a394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A394 10740 bytes
SHA-256: 35055d1ac6cb2831861119fa972439383334993e0de03e4e7a28b1dffb96d6fb

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