Malicious PDF — malware analysis report

Static analysis result for SHA-256 773b32731f4ca582…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 11:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a0cb75cfce2df555f6afae1dfb05030 SHA-1: 18f4b22d8f0af571d578b4eae40475ed5dc9ceaa SHA-256: 773b32731f4ca582d454c3f7f528f494698cd5be8c84cdacbf8a155402f8bde3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609748cddc215---65769693585.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9b833f6fd31c2b6277d71b297350c52/27115257627.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/nowepivivunetabotokokak.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xuvodotemoja.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/27840240504.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd11169b8---53019334657.pdfIn PDF document text
    • https://huaku3c.tw/uploads//files/202108111536442997.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/cc67b2c89e178165dfed5734d63b69a7/tuluvovem.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/liwazapikupol.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7a586620---xasebilemegizebikuvi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/eg0423cru7tvui6eic6ls556gd/7687321660.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/pufarixizumoxagamawi.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/nopitewe.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/folaxipigi.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/27430110902.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/64a0757a5d219d1bdb8502a50ef77169/15338017269.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/17199111870.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/97063892205.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/rukojevedixavagimogumole.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/70384808661.pdfIn PDF document text
    • http://anm-av.de/uploads/files/51966826068.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/34072288206.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/97527290233.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0b06779e---xomibujuxepidok.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/95336931504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=a+million+years+ago+sheet+music+pdfPDF 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_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 11260 bytes
SHA-256: 02b07694b8efbcae67c46fcce28e2db244de0f15da0d1e1f0a5baf41a604b983
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 19588 bytes
SHA-256: d53ab0ad8cabbffec7a75a3691793d5dab2dbe4f93f02590426fb7c758558b95
font_02_sfnt_off000137a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1