Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19f4afdcb8e8929…

MALICIOUS

PDF

96.1 KB Created: 2021-08-13 20:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 177e3467e6ebc919123cb75227c9ef5c SHA-1: 19e380734acfa35f61615b137cc3c87351a66223 SHA-256: a19f4afdcb8e892942a099eff5e9313212830bf95c704a61d652265685dfd76d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit user trust via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=exploring+corporate+strategy+pdf+free+download PDF link annotation
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b741d67cc---670572299.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/vufoxadutomelimizemo.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/19317299809.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/50464857358.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/44206114146.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2017e942c1bab44c434282222ccf9102/11038207885.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/20921610008.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d8543941---xojegixigosadelep.pdfIn PDF document text
    • http://strap.sk/uploads/files/panelalitufalunav.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f85d1e7daf630d4fc2e5d362117f0b28/82645212102.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/80349045526.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/21977574931.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/97982192567.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/84095606827.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/juwexeguzekimut.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/4510681868.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/dilosigunatexoz.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/88806770211.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/rixefimuxamakipem.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16113129533fda---20019149807.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738b7acb11b---lekad.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/42050513503.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c79c45f56---dotor.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_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 17724 bytes
SHA-256: c7fdf8df48796294006d2f87170e1c3594ce07d152572736db48a72b3fdfb105
font_02_sfnt_off000157c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C8 11080 bytes
SHA-256: 0889e4d118eafbf88b3a6c3d432dda70e6ca21716e7a8190a6f756b219298bf7

Open this report in the interactive analyzer, or submit your own file for analysis.