Malicious PDF — malware analysis report

Static analysis result for SHA-256 2556d5abf7dc0438…

MALICIOUS

PDF

88.7 KB Created: 2021-07-15 09:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b57d2ff27ddd4ff80ce0ed37d2cfebc SHA-1: 3b3643179c43e992c082da5aa3a4805d66234dfe SHA-256: 2556d5abf7dc04385d24f13e8ecc732a8c6b77a21c018576b55a4608222d0074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links and the nature of the hosting (compromised CMS uploads) strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://medvor.ru/uplcv?utm_term=ism+suffix+words PDF link annotation
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/m00f3tp5ql1bgnaj2aaof9u06t/21541319758.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/11227873709.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec269b6329---30052594858.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bejtcdakoa2r2u5kvn05005a0/vovakoxebelitorenatiri.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/1788c6a2f358f143816d51eb91221127/6220281477.pdfIn PDF document text
    • http://2440027.ru/upload/file/penogokaxasovafodobu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ghkkv880b7ftmgn8i7ot577lbl/22415202196.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/dixulolitam.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/zigafu.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kurajufexivigut.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/surevij.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/leraj.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/176d18b703444fdd1a9a9bb606956a4d/85244362073.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rloeqcuerl29dhoku4js1lsv15/visojifumusiluxewitujane.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/kebepabekafekumajanazox.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/pexebevo.pdfIn PDF document text
    • http://centrons.com/uploaded/file/67662571060edeedda22df.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/gifuvugaxidewebunikuvog.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33092acbc---44928201424.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/58786098648.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/70346743150.pdfIn PDF document text
    • https://blogsma.com/files/wulujonapax.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aff01653297---98256238795.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 2444 bytes
SHA-256: 6fd21dd43cf96ed1143bf690a6ae77aba3a59d5ecb11672cd89a8065526c7c14
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 10212 bytes
SHA-256: 81443ca41833bb239d3082da15180f96700be2a0b23ddc3637bde34267478f3e
font_02_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 17544 bytes
SHA-256: aa022855c49635e273de2a73ff399691d26a7390b539dd13c80025ed31e82455

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