Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5688c7169cbad7b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 05:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b310fd947424293d267dedad1a2e599 SHA-1: 9386a9b437c3b6d5ed7dfad304d7e821db954211 SHA-256: c5688c7169cbad7b34900fbd153d905cfa27de481183653cd77f680dbb8842a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=7+feet+3+inches+in+meters PDF link annotation
    • http://atletika-pardubice.cz/files/file/giniduxudaw.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/77717927100.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a3342283e8f31dad05e4f12e75ce0db9/25738301213.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/dulawilixiri.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946c5a7a5d4---xawedomofilumopakow.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/28821505822.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608704ba16b56---lijupuba.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/pitutapaxonegaveje.pdfIn PDF document text
    • https://ever-progress.com/upload/files/rupegupazedipidirutesif.pdfIn PDF document text
    • http://giridhareye.org/ckfinder/userfiles/files/setubizewelukexap.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706e118bef1---76602214114.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096ecdca0540---xuruzajevabakesibegowijus.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/merewivenufixex.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/milopenutewa.pdfIn PDF document text
    • http://domario.ru/userfiles/file/mivaxujabamup.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609630ea9383c---relewolalegu.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/81410029150.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9034b222e86865041e0e360a10eb635d/64016863978.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4hb6f0plgg4vvj1ihl44vmu7b4/16821777666.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c055af1b6---toragixeteve.pdfIn PDF document text
    • http://suitianhose.com//uploadfile/files/86680580066.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cb0c871bf---nowonaguden.pdfIn PDF document text
    • https://digireg.si/upload/71346260997.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/keximemu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098366c2a6d8---24791581190.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 17600 bytes
SHA-256: bdc71fee9f6c0079ef5bde3f3e5d8265e246c1a5b3027ba60d6c9ceb5ae62549
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 10400 bytes
SHA-256: 2c0c3f5c6954169174fa41ba4855bc799ed512d661e4188bf40a6205b4ecbeab
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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