Malicious PDF — malware analysis report

Static analysis result for SHA-256 890b52c674c1bf54…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 03:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 532c5e58caca9bed2f0e23c536e3a21b SHA-1: 126c434c279d1aac77250f5299bc1947d9a8afc6 SHA-256: 890b52c674c1bf5408ddd578722ba33bc4b1213c1bfd617f77274af2dce50c57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vinacomvietnam.vn/uploads/news_file/walemudizofuvibepilosu.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0a2649bce---widemanirofafas.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/51e0a1c99509449063461650caa94c06/pulagapub.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/87884308906.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608048242b3c8---55308746847.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/59880629766.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7eoe36unme53g5aqqpvegrdpvn/lifudavelobawobekokilago.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d86c2bc0---83749011262.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/fodabijapokukapifunozomas.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/sajadabipesurex.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/vanexakorejipowirukeg.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/m99fkuol2npl9e1m982b3h6slq/niwukalibap.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723a2e0d4b0---solunolajopijew.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6363fce2---46179848019.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c419b57d9ef---36523320102.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/18d1db7acf1207c8e1661935b14302ac/44752367698.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/35751126922.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/19205291340.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210730033102.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c705040242---taxovu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab55de6cd3---19817032901.pdfIn PDF document text
    • http://voijin.com/userfiles/files/4113078243.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/pewogizexivisugovogufa.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/1522781990.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/85056851587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=troponin+and+myocardial+infarctionPDF 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_off0000bc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 14484 bytes
SHA-256: 455f693f843bbc6fd287492c54cb26567e5b63392e5e480376d763b22e29e0fb
font_02_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 10560 bytes
SHA-256: f811440ba5290e189848b6441e46d7594fbba2d49e017c21147b5814d9d0b5fc