Malicious PDF — malware analysis report

Static analysis result for SHA-256 280ebc6bd1e60bee…

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 05:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: facbf697e255c3677f689a2785116a22 SHA-1: 54574afb0184bd5bfdfc72859863fdff1c3c313e SHA-256: 280ebc6bd1e60bee6923b6fa02f9ed4d221cbc920e39db59b5dce6b8b6aeed37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting it acts as a link farm to redirect users to malicious sites. The PDF's structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8c3c2cfee98f4280d510c5b8eec85425/monuxazevuziw.pdf In PDF document text
    • https://pindimana.in/uploads/file/22784476131.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/55469272854.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/guriwekeg.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/kovilopolukumis.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210806104324.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/71eb5d1030099445762ca177928231a3/puvakaluvolarupu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/efgpp5gh2l02073dc8n3ppb005/9051258693.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/49662280385.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/denok.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/jajosapokirumeku.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/48140451463.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nesowiv.pdfIn PDF document text
    • http://indel.sk/userfiles/file/gotifulob.pdfIn PDF document text
    • http://sciattella.net/images/file/dogag.pdfIn PDF document text
    • https://hiroyoung.com/data/files/80748763787.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07a8a1d7b0---petowunokoz.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb99d25cce4---93591447855.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/75856291001.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16099c950a4300---17268934165.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160966d1143274---towunidubi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/562d384635f6abae343e11dbfbc746c6/makufoxolexetirisisusazel.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/soviruwobumujo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3022983830f054cf3945e8b695a69cd6/68203084085.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/gamafolonuzuporedox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+black+out+items+on+pdfPDF 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_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 11092 bytes
SHA-256: 7bbfe73fa44b231ac865b897ff7cb4e94a8a0a0519729165e69f435eca0eef41
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 18056 bytes
SHA-256: 89340c1be1b20789143b65c5d7a8bca2ca5c25416d1752d39deba89daac499d9

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