Malicious PDF — malware analysis report

Static analysis result for SHA-256 2775478a13044504…

MALICIOUS

PDF

92.5 KB Created: 2021-08-21 02:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42f63ab0a61963b42d2cb6c5496a29a4 SHA-1: 634cc88ab1913a28b4f554b3212c0b82f67e0204 SHA-256: 2775478a13044504ff5d063b732ae46fb290d49d3464aa43dd4cdcce27579a55
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/remijabokif.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9b83cf5c1b9a4809cab30e7fcf855b2a/todejupuxosimusil.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d28b6d5fd1---zapulapewidisijuwugo.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/zitevuxi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcea2ef2981---misopopamazumupab.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/mivarovanimuwuru.pdfIn PDF document text
    • https://cecprint.com/images/file/minikidozunowimevomusadew.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609873b9479ff---purafi.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/gemewodomajobiva.pdfIn PDF document text
    • https://dm288.rs/slicice/file/47504455093.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d350348967---tidog.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/34218344142.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ponokemepe.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/40000036348.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d58cabea91022dd598cf508acf29242a/wunimofiri.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/93131767513.pdfIn PDF document text
    • https://baongochoa.com/upload/file/dajelolada.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/3346822511.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/41069925559.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/sogonigaxefo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e394ca4864---tosegumog.pdfIn PDF document text
    • http://hasyo.net/files/file/wuzexigedolitinuxudamodub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+open+polaris+280+backup+valvePDF 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_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 17884 bytes
SHA-256: f2760ba40e2226e29ecf0e4ca1142d1fcfd7a8d53705197dc066f533763e90ca
font_01_sfnt_off0001304d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14864 11292 bytes
SHA-256: 85e15f8151597a4839cff366b9ccf25772a03c4a958180ecc8089ef2dac653e3