Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf579f7e3c26faec…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 16:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 012676d8815f37ebe4a9e6aa91c096a9 SHA-1: c6d56a4f3ad2ebf16d79f97199611d537460e09b SHA-256: bf579f7e3c26faec86cfd64da3c708c75d6fc2908f6f9986768d3978f0d6ade1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly implies a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xycrusher.com/d/files/limosazigiwejakilibijaf.pdf In PDF document text
    • http://sammyuriasproperties.com/userfiles/files/pofegorobabuzadusoxafawa.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/tizonumuburogojabem.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/refowifizozef.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078418820178---vanikodaxuwurus.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/27595733222.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d80f18b29bcd6d347f53ce0fb3aec67d/41051981164.pdfIn PDF document text
    • https://abeess.com/userfiles/file/8769997658.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d350a49c---27506027009.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/wikamojif.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/978c0d2e4e6396f1d7162aefd067c130/42296415506.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfb555ea05---22745351671.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de2a0d463---15487142206.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/70554299790.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/46658541798.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/77060584232.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a22394f20d9---96273834054.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/nanemowibulotisuv.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5712e974d50a9e9cb577737b56fdc8f4/samupifumegu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tosefirazuro.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zadodoxigusoxebo.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/8070498061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=topic+by+topic+questions+and+answersPDF 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_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 11008 bytes
SHA-256: 45eeef90f380887daa5dcbb2e54a70152029180a0d302c5cab84760ebd521e4c
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752

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