Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfca2e98d952a98…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 08:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20f3b2b94aa6d0f9af430e140c2967d7 SHA-1: 8081deb596231a69d8982e62f6d60ec890229635 SHA-256: 4cfca2e98d952a987fd04a2e0a271e442780692e7c4e6d20d55f611ec3d90e6d
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and compromised upload links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=meaning+of+screen+overlay+detected PDF link annotation
    • http://klimatyzacjaradom.pl/userfiles/file/wujaderabodazogafudejatu.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/silewivugi.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/64296846453.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kakokusujukokafejipokepeg.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/jawewekozutotuxumolatus.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/1365033042.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/kilagetujunoge.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/16875962602.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/mopavef.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c9c4a10ebfd2742ca5225fd9d69f3f91/98959961901.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/10119146298.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/92998449988.pdfIn PDF document text
    • http://nenorm.com/files/files/51396275174.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/babf959599a9748aaa7eeda81ba995d1/fowujisodejitexaso.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161367263c5717---tunalufusub.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2hhpq6e83e0t1ipcdisplb0l8n/74686552557.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/17517885238.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/rajinigabigakedajutoju.pdfIn PDF document text
    • http://trivio.it/userfiles/files/nuturarowefesedapemuwo.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/80708401627.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/73329879189.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/pipifosok.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/96614686970.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210910053542.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_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 18752 bytes
SHA-256: a9d54b68bac059a7ec13a8621506a8c809a730cffc26e6b171a41613799e90a9
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 10824 bytes
SHA-256: 7c6c42c32645cc9a2142f6b11054da33270648abd7b5af93091f8465fbe5349f

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