Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b8433097256790…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 12:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8860681958ef0f120fd553737ec9730 SHA-1: 6986a8ca06391db3b0a866b3162c418b81b5c3e9 SHA-256: f3b8433097256790d50b39ecf6b4f655336837026988b10ed6ba8d10515e44bc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://clubmaniacr.com/campannas/file/nafig.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/87720021271.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/990ede4995c150ff282d07c3727069e2/nokoburovulowuzef.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/12098804974.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tumoviz.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/xalewaladikemusadozi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lqe5v1f0ke618183nfqs8f6qok/60846201192.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/95374690b952caf065f7c85b9660ee36/63579538575.pdfIn PDF document text
    • https://renault-service.com/userfiles/fepepomusajidewobunopa.pdfIn PDF document text
    • http://amandamaitland.com/images/file/82665538204.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/22ecc6dfa2323664aba5d2bac6a4f3e3/fanifonekotuvisopokoj.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/lozineg.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb3571d81---63802678612.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/6654081331.pdfIn PDF document text
    • https://birotex.rs/images/files/lidilapunerok.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/71567802831.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/daxaxajomopuletiwoja.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083e86d4ce56---zirakunudugi.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/vifufaj.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/cab5c158096f1c2ff613944cd61aa78b/89196050094.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607f791d4b248---genagedide.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/wamewebi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac46491a2cf---67713736587.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/govofixefipititoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=thyme+and+parsleyPDF 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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 10424 bytes
SHA-256: 63724f9d9339158609cd564ec361e7be26d536e39e23d8378d15022bc0df0a3a
font_02_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 17248 bytes
SHA-256: 1928d02a29a6413d40d5472058abdbed66f8928efa6609b31e70d89466a2ca56

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