Malicious PDF — malware analysis report

Static analysis result for SHA-256 947d81c9ea71609a…

MALICIOUS

PDF

80.1 KB Created: 2021-06-25 15:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5d7bf2fa699e37931c22b68fa2eac3d SHA-1: 3e89b0f49b5066783ffbda357e86872ef0a5b5dc SHA-256: 947d81c9ea71609ae2acae066cc000972bf00fb8df988b636a03e7f7360669d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.bluewhaleline.com/image/upload/File/59259638800.pdf
    • http://mamnonlittlesun.com/upload/files/33862473032.pdf
    • http://gmei.lt/ckfinder/userfiles/files/sapadiwufopuzabazor.pdf
    • http://files.ibiza-ferien.de/file/tatewenorekep.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d11b7db16---59744412908.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092690d00c53---goxulopupebogaxegi.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/99c72efa67713ae83271b34986b16b9c/nuvaputikivejevimonaj.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d7897f6755cab196faaca89eb34dd68d/56741241444.pdf
    • https://medtek.vn/storage/file/40399846700.pdf
    • https://mallncart.com/userfiles/files/42137757056.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/459814fdc6d3278fa5ca97712d7c5022/zuxiriminerem.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d6465452c---92969523787.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qmo6cebjioi937jq8scbftee1o/kipuzeluriwikedelip.pdf
    • http://abwrva.com/uploads/files/67820230806.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/fufosijolidegejenavajuxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+does+second+cousin+once+removed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d712.bin
a4bb3ba8d5fc6e3a05f8b9e67799acad37b97e2f2701ee5652bbafc31f2bd7b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 10748 bytes
font_01_sfnt_off0000efa0.bin
861697cc07e30717ee2fc86677349eb21e9ac4a2ef420d1dc172d8401b01ae27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 17144 bytes
font_02_sfnt_off00011bd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 16792 bytes

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