Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a46f6c862195a07…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 17:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36588c9f7e1c6055e38289f905a223b9 SHA-1: ff43344faf23b8a811a2c06c39eaccca2fa9f7e9 SHA-256: 2a46f6c862195a0767266239bc4d76c9b7534e861c1f61d840537b806bcdcc98
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for fake issues. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xn--49s538bo8ux8c.net/userfiles/file/tojoxavaxetusubugulevij.pdf In PDF document text
    • http://av72-reklama.ru/userfiles/file/163136867319548f01ca35bbaeeda7.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/72455003849.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/josarifa.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/34856400235.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/22221438557.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161413a6897f94---figaxobed.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/dasojineru.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/95651991397.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/29807648537.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/53565076314.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350597a3b8f---gawalenugolesewagepa.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/paruxoje.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/nerugasanavolib.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/45423940227.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28196426543.pdfIn PDF document text
    • http://runhouchem.com/upload/files/96824243624.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/26087340838.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/tipidibuzesikewivizalon.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/80845338440.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2b4d8e91---1334049140.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/pirijurol.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/32531584296.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/joxexewimivobatebodotunu.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/biposukirotewofis.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/77764302802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=visual+basic+excel+tutorial+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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 17584 bytes
SHA-256: 576fe8f3431e2bc9bbf321b858705f857db801819e8f1fd1f6b76d02145cf213
font_01_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 10820 bytes
SHA-256: 39c438dbf64d53fe723706a41ed978266a039b5d3b54be0c0022fdc867d4c82d
font_02_sfnt_off00012289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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