Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4b1f4469b31797…

MALICIOUS

PDF

88.7 KB Created: 2021-06-19 21:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f2bb06236e84b347924e570bd0bc32b2 SHA-1: 1922c4051bfc72f24d89168747c761bf596d35bb SHA-256: ea4b1f4469b31797bd5be767a2bf96f5a28d8e1073c8d6c1b0c8bcd4f450b2df
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 0.9996

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://alarcon-v.com/editor_upload_image/file/vinel.pdf In PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/26484584260.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fecfbdccf1---9749786226.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/48828349468.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/532f83b507df889cd5fb6b3fbf6e10a7/19535652074.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zodes.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/psath8geo8cfh4tncoadgcjp0u/54199927693.pdfIn PDF document text
    • http://innotack.com/userfiles/files/pizologabiporid.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/monekezoj.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3852d7422a432cc8e6047677af4a3fd5/givemubikok.pdfIn PDF document text
    • http://bronia.org/userfiles/file/zajobufopuralasif.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f490c90cc---23105652484.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaddc42c5f---zogirabuwezugiveguzid.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4af4a262c4aa3d70e18fd9e9694c3eaa/rozoxire.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/ropipubujifutin.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/37708145756.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mahalaxmi+calendar+2020+december+mahinaPDF 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001382d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1382D 7984 bytes
SHA-256: a445ac52f009fbbb4423e6752da2c59268c3199d2b45102633cfb5b0c6152190
font_00_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 5488 bytes
SHA-256: 3a27a883f18727296672cd2ad910434d95fe8fdce8cc20075bffa1b163622e75
font_01_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 10692 bytes
SHA-256: 14ebdc032b288345e324fb0efbd01daa2fc27d8d525f91018edf46a3d21983d5
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16228 bytes
SHA-256: 2c9f402c5a8e52f0ce4c91514bfe76f9497b7e43743ba2dc95ddc8211c6e7ce9