Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebd8a93b4dca102…

MALICIOUS

PDF

106.4 KB Created: 2021-06-19 19:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fb72879cf047bb9a70eb6ed015a9baff SHA-1: b92a34d3c9112438cc332ca93584af054f8522fa SHA-256: aebd8a93b4dca10203c2c1f931df26805be6f076687d08c621b77fc2f2f700c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://am-assets.com/aom/magnolia/userfiles/file/sawizifaponevanifemuv.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f927b90b25---92851108052.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/76168241373.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/tisiwikorufesi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69cb78591---49703178363.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca02f27aa7---bipurupan.pdfIn PDF document text
    • https://defaico.com/d/files/nomakotinujilupilezut.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/xatezeronixurisetezav.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/csnl03uj2ech8t7qhmuva8k8p8/59775652912.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9rttodv75qdn400apkv35p7fl5/firosadelomekafa.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/60742709351.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8101ccf1b0c180e95f05d22b22b3cfdc/94235246401.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec5acdc568---lawogepelapuwifuku.pdfIn PDF document text
    • http://jarosi.hu/files/file/vufubugorimufofizeri.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a64b3996f---23200214237.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sazebis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=elton+john+actor+rocketmanPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14995 4696 bytes
SHA-256: 188ed0e60a02d7e8e7988cf69a88b804678acdfb3b28508ad92fa0c05d2bf822
font_01_sfnt_off00015953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15953 2252 bytes
SHA-256: aeee9b2fd577c594ede074a7e3493832e024aab8d381a7c1d16527c2e435dd06
font_02_sfnt_off00016391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16391 12240 bytes
SHA-256: 0eb6fdc4a405a80ea26d4313772facef847fcd773723361f5da1188f0fe23b88
font_03_sfnt_off00018ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333