Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d04054f8e10c96…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 03:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98fd36cc0690a5f0f09835247e3b44aa SHA-1: a3ca2ac1e6c7df8331006d4110aaefe10d973c2c SHA-256: 45d04054f8e10c965791536f3be0053952bb8f905b9ceb83fd59ce8c7298d55c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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 https://akproauto.com/nbloom/fckuploads/file/28576108933.pdf In PDF document text
    • http://rheinmotel.com/userfiles/file/4538045498.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/susupada.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427cbe4ce18---vegujufis.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/moxab.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/39580464290.pdfIn PDF document text
    • https://atrax.hr/files/70489837613.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/50301013654.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/koleluleri.pdfIn PDF document text
    • https://laser123.com/geektic/files/kepagemotoxapoxo.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///devofepakobemudow.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-17/20210917135546425520.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/21944551631.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee206c025---79350108417.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xikugekijumaratimesubem.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210918064457_1u86c6.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/45046697135.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161401dec06f44---25441423414.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/vinimolepilodom.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/22048976093.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/detomazuwozupesug.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/josupewumatesepege.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/87818632181.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109020058406785.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/levibaxekalijeriposod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=print+awareness+definitionPDF 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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 18252 bytes
SHA-256: e8253e32cc7c2e9714355dc9690edd55967f78d4a32ad4b26f9073e3d60da4a0
font_01_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 10388 bytes
SHA-256: 0df0561e149e62778c48602841b837c70eed6aa26a51619e2140f2875b87b47c

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