Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a74819375c651aa…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 07:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31f548862f54febbcca1276732718809 SHA-1: 12a01134ddd2015d3b2b977dbac61be5185f3654 SHA-256: 0a74819375c651aa1802677ff47d92597fce90415a3c9c490acaf5c28fcb01d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

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://nomylo.ru/uplcv?utm_term=promotion+acceptance+letter PDF link annotation
    • https://medosojewellery.com/userfiles/files/jamorekupapobaradufojit.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/85967783822.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6476d523---74547995739.pdfIn PDF document text
    • http://rayer.cn/d/files/xutifuwediwefosoruvigore.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/naxopixufo.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/30134399859.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/46578105999.pdfIn PDF document text
    • http://topflexsports.com/uploads/24391141517.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/10911155780.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/72281610060.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/27375787780.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/11756583032.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/waxeruzenolijejezubijiduw.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/3121899589.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161361edd1a783---fojasejiwipowomirawazo.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/ludixiwowuxesuga.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/47171673113.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/xopojaxirotogizikatufepi.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/pujisezewo.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/83361183303.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f63c5aee29---63429496553.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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 10368 bytes
SHA-256: 2ef030ba06f5f77dffc5bb54343b59419a8a5e16022f368fca179ae58d350985
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 17512 bytes
SHA-256: 4d70fa6770ed640fb7257b2b62928b9a9cc6c3446957a14c60edb3d48a33800a
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1