Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2af25040ce993bd…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 10:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8f5fc19d1fb6c006e6ddb20da1230c1 SHA-1: a8efc987d3855aafad2530e2f2dd50c96e480e0c SHA-256: a2af25040ce993bd25f5f91c70d8f8999bd8ad9a7813e256aeb51b819fd9ce24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and the compromised CMS upload link heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=causes+of+fatty+liver+pdf PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085688d6a63f---niberomilig.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629c57a00a---xonilodewixatiduduzojevo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/d1ab3bbda757398827c9fae6cbb0a5a2/78040053789.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a6368af7---70274955983.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/95518694321.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/88200526445.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/seramibox.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/146d460a31ff326d55c4b4f56f0ee1d1/88449922878.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/2p7ll1i5fq23viiddm520t1n91/pakifevejanulesosuwi.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/33708836038.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f802bcb63f6---55368150462.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/34673120723.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608625129c71b---newewonepusetanaxiz.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/o7gn5rih77fp20a1nr9hmbnbb6/nisidifikizazazolufo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b83d2ff3379---duninexuse.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/71473303608.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/guvunemimupukapatibujikow.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607971d1a1951---zitorarifejuv.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/iapcl7kbsn5fb0eb92md0j8sg0/vafaserin.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/17608039859.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/67166011367.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/najuxutojujasilonokaliva.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_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 17024 bytes
SHA-256: ff4db1ffdf4039944e31b1011439c11bea1c931d554ebebe9ee073fcf4283525
font_01_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 10696 bytes
SHA-256: a5acf96796f220b143d7aa8a98b0e9fb5319d2a013f70678a7f9ede3fd270f15

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