Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce42a0dcf91a81b…

MALICIOUS

PDF

94.1 KB Created: 2021-09-18 04:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc7606b2ce96e18c5386379ae0c7cc8b SHA-1: 9377bc5c2c4680965b637873cb0848dbfefc3bf6 SHA-256: cce42a0dcf91a81b540525d9bda443504806bd8429215c391de14a9d262636b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 https://chcial.ru/uplcv?utm_term=how+to+take+screenshot+in+mi+a3+after+android+11+update PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614291ea6ef75---20245611658.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/58350805579.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/guvelofuxakesi.pdfIn PDF document text
    • http://entrackintl.com/uploads/xujajupifugome.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/68213065092.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffea1eb18---puxuxajojuninilo.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/11390719417.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/kafuxuviporuvo.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/kezofi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1d44ab338dd3f3a3aaab474ee48f4351/50627442813.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/mafosokejalozuji.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161325da9279aa---63785141587.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/82938739371.pdfIn PDF document text
    • http://rrarental.org/upload/file/ruritanolixotogakej.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/velizexuzubemoxiti.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/68227872765.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/sanekebezusapoga.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/bezemanimepitijuz.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/rafitunejazosuk.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/19352253868.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/67437267504.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53e24f234---tesisefega.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/parumigoxubipalakagine.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/15142702329.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/ritidedobavasabe.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/62134735104.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/46bb9b27fcdf8df34143cf3f19d76b8f/45877471084.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 18692 bytes
SHA-256: a7800ab2c4ffc5c4f6e0f827996d052b395faa95357e303a262aabf4d73008c9
font_02_sfnt_off00014fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC5 11332 bytes
SHA-256: 61241747b1948109e2e38e1cb9ceca19443f0e9ae65923733f4f128a4258a3f8

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