Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3ff388f19e86cc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 16:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7decb41874a2ff4317eef66371961f5e SHA-1: f3e8ecfa5d795f71d3c5efe08fd570d32c1bfbf7 SHA-256: 7f3ff388f19e86cc0f536e3c864b973c48840fefe467419ff9a027935333ed38
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and acts as a link farm, directing users to compromised WordPress upload storage and other potentially malicious URLs. The primary purpose appears to be directing users to external, malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=emulateur+ds+gratuit+pour+android PDF link annotation
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396f3250175---jumekolodosudurokekefe.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/wipibaze.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210903_92508320D54FEF3B.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/84476249013.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/ponigabavokup.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/puvivonoras.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/77995150919.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/25e376a602f88a8d768fb22d1d26a0f1/lojelexaxetipox.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/pixigijijiviguxejisu.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/woxide.pdfIn PDF document text
    • http://texmet.pl/userimages/file/pidebiver.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/tunanuwazasokuweta.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/fenegogiwilomut.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210912_225258.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/petupemilabiviso.pdfIn PDF document text
    • http://geose.ru/userfiles/file/pulapelugi.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/tetebepupiguxonokizame.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/81837529665.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/33276402331.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/81917261392.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9c20b61e5f74b5b172717ea0bb8c990d/4890598148.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/tenesuxudomatadelopodoke.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/11318485154.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/76665887257.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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 10816 bytes
SHA-256: f6fb061e9800a91e77e808298c6c00944c91604557a7347d79e70b9c4dc92910
font_01_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 19528 bytes
SHA-256: 5fa5076a627ce72c39651da35120d78b9493dfbfae975b498f00ac4fddc0aba4
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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