Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1aba2c3b39f98e…

MALICIOUS

PDF

100.9 KB Created: 2021-06-27 09:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 73cf3c286a7f0efc015d697edf034a9b SHA-1: dd6ed319779127fb1120bc57fd8077322311d4b2 SHA-256: 4a1aba2c3b39f98ee758371f367d2de4a443b9b9f72a24db069034109abda038
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=active+transport+facilitated+diffusion PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c30f161b0---boleravesixusoxazufeke.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1ebe78b0---99001502480.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/94414529100.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1444024ee---37726933229.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/pufekator.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6417876fa8fc1ec07b37fe0530ffc5a1/digamedizotije.pdfIn PDF document text
    • http://sam-global.info/files/file/roxurorititejaso.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b422e058406---rusobax.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075fff72734b---42552312853.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a044eb67d39240e9982f5725db7461dc/mokodujoditoz.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/lifumeruf.pdfIn PDF document text
    • http://polkovnik.su/upload/file/nitive.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/reburejadosojiwipusuger.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa16ec8bd4b---sikagewew.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/71816190744.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074260d4ea0a---51092215006.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/15684838450.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c2eafe594dcf2303e980eaaff03d81e4/73631989591.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a7e6c7f5---suxagerojepeniz.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3gpbpdtvpnn7r85lt922cuasvh/19495867045.pdfIn PDF document text
    • http://polkovnik.su/upload/file/22890380291.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/63526250252.pdfIn PDF document text
    • 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
stream_002_off00010849.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10849 19324 bytes
SHA-256: 94686fb6eae14dfb199bd779bbc212487a5b2131ce8a80bb574249458cf6961a
font_01_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14013 17292 bytes
SHA-256: 82aaaea2adc1fc90a1ca5b3b69dac80bcbe4285f4635fcd63ba97d5bf679983e
font_03_sfnt_off00016ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE5 10760 bytes
SHA-256: edf7b27a7821821bae0e06845bed803a006bc65edf76971a44875f3ffc50fce1

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