Malicious PDF — malware analysis report

Static analysis result for SHA-256 0902bb4bd81b80bb…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 08:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e69dde231cf42125c19f4667a163b7de SHA-1: be5b4b375fd54ad529977cf507705c762335bbf0 SHA-256: 0902bb4bd81b80bb6c3113168dfdc7601cc1dd7abacae03ce1f47a30d1c7951c
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various potentially compromised or disposable hosting sites. The embedded URLs, such as the one pointing to restorationservice.ca, are likely part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://stoka-saarlouis.de/userfiles/file/fezetobobemowemuzixi.pdf In PDF document text
    • http://votejoedestefano.com/editorData/file/pagesufakiwaguka.pdfIn PDF document text
    • http://gdgom.com/upload/file/210904003625008678ifmwh8yb9jh5.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/javewitoxujawu.pdfIn PDF document text
    • http://rougezenekar.hu/files/file/2624025709.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/76909746793.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/43935867010.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7381c0a3---wapalerotituxi.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/duziwedoxupaguxonag.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/zusegagowo.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/bufepejonuwonedale.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/45371681294.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/jivoki.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/28385774811.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/50451567364.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-16/20210916002416770164.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/xasizami.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a1vq6t0ph53emkbs05tf6kp9df/bikuxilofudoxisogokuvum.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/51094264591.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kukoxosowireratejajarid.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/24708883571.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/90978584413.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/230cf379e1dc9b5663843050cd507e4b/xabezez.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/63ao67vdaoer1fd1koqate9f9h/bafadepe.pdfIn PDF document text
    • http://smirna.pl/files/file/motovivujad.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/bodadajifetugomezatower.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vsco+pro+apk+iphonePDF 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_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 10388 bytes
SHA-256: b392bf0f9f8707bd51d347e49bfafc0851ce07a01d8e53f898720a42b3930095
font_01_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 21216 bytes
SHA-256: 423ceb19d470861861fb51acb043a9637eb75bcf9e5e3480934042c0289f9109
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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