Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac74e679a75c58d…

MALICIOUS

PDF

89.2 KB Created: 2021-07-04 20:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0d54db408ac0b0e8aaf4f42c660897f3 SHA-1: b126caeebc8fcf6c3108082560e907dbf5d305b9 SHA-256: 6ac74e679a75c58df6bf18f3fd813c58cb02c3ee31d632e40c1440adab3fc0d6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hongshengfish.com/uploadfiles/2021062709574775354.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/50f85dc0cde610514efed0f6b1b29a57/tupelomisupolefopuvadijug.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/r0qkbn9n76rtf01hvvbiagkj90/35197538128.pdfIn PDF document text
    • https://epiphanych.com/images/file/46013341594.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210630221337.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f3e6302b---65093491889.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qp4ietsgallsdioj3p8j3f4p1b/devetup.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f156c42f51---68879628577.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/b9d35b7ccf322d536e05d51743a659d3/55331000007.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/bebatewajif.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/2371904368.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/7166543833.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/revugolifuvuxun.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a64477b35---69071865157.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/82q7549dprqfd9cl5ebo6d5ka1/52971588676.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ledngckrdru8umdd0hamgke9gs/simozikabumibusef.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb1cd5171---fejipe.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f559d2962---50286730909.pdfIn PDF document text
    • http://schokozentrale.de/idata/34850695537.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6088d66d---30019578152.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/43211eb3dc5d5444151c98762604f9e4/69696986707.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/6010133967.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///24299403002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ric+flair+quotes+styling+profilingPDF 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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 11060 bytes
SHA-256: 06e69fffa5ab247610beac64adc00258ab5abc3eb6be377a718a21b2e2872347
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 21164 bytes
SHA-256: 48ba0480d09a406555c62b86e4b2935186cb2b2e04ccf6f961b95c6beeda9b91

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