Malicious PDF — malware analysis report

Static analysis result for SHA-256 a113bffedece49ae…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 01:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 149f8663903eac958352d77a6109e8a0 SHA-1: a7f6753445115c8cad1cbf26f9d0c6a6ab3622f0 SHA-256: a113bffedece49ae3d6d9dbd799a81b73f9e5bc6a8b939a3068b3a64eac7e152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. These links likely serve as lures for phishing attacks or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://podiummagazinenews.com/ckfinder/userfiles/files/90900445496.pdf In PDF document text
    • https://reniuved.it/file/10213684971.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/53367051027.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13773326810.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/45661835841.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/titof.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6dc846c9---powodutimilikejex.pdfIn PDF document text
    • https://bak.vn/upload/files/kinasu.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/padosedoso.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/bikajo.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132369a6e8fb---nefabutonoxifemezafa.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/67938691828.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/raxofositaj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5ba7dcf0---duwususosuko.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/xoxobu.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/61828403938.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/220e7a502e2d089404e59694feaf7f05/luritekewo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732fa0293d---96264452201.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/fokopufarove.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/87709776731.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/18214170214.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/gebupagorogere.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/wewemifatupak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=games+to+play+with+gamepad+on+androidPDF 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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 17876 bytes
SHA-256: e94ec0a64c6c541d362ca16d9436ff87ea6801d4d06c98e69f0f082bdf798383
font_01_sfnt_off00010cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 11076 bytes
SHA-256: 671cd5e00ce10f7f5cd77b7000e497bf040f80a4ba8496583f4f5c38a760b930