Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22bf9124f1165a2…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 04:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8d0a54d3fedd11e81c24ff742f7854b SHA-1: 013a133f59a7e47c4686b5d4f33f0f7eda957003 SHA-256: b22bf9124f1165a2ebc73653f3d454576dc56e5cdde6426b5f407c08413ca48f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=regulated+shunt+compensation+pdf PDF link annotation
    • http://sportingclubalbinia.eu/userfiles/files/zapivomixikaxurenerelovu.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/didizelirevadifofapo.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/tixinu.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4af71258b5188579fd2be98c2fb1dc6f/86635306905.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/lesipobapizemosixenor.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/xirimejiragodirijo.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/20548248789.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/xirupudapuv.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/94461211049.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b08b2ce98---50506515091.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210603171738177.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429142932579642.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/16564979313.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdd80d018---4854907634.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/bazabe.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/45543618509.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210905223041.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e672ff4b391e6a1b4a724aa1d0f4e6e7/kirudiminefufefakugo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086793c75b54---paser.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/buvijevisalos.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/ragixidem.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608620d054481---nipezovaxopuwelara.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/ropuwuroxitefidiji.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/xelofaworamataje.pdfIn PDF document text
    • https://trieurodata.ro/images/file/linetujabazuxu.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/pewef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 11112 bytes
SHA-256: 4585edc479b25a2866fa6cd2d10691a7b627540902f0751f4b369b5247d49496
font_02_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 16912 bytes
SHA-256: 1dec995a2a85377560bc02db6e0bec9f866689b7c9b4cc3d30f3bc6d58a695f1

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