Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab590bee4dacd126…

MALICIOUS

PDF

74.9 KB Created: 2021-06-04 04:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b98109eda5249f8ee9d6b9ffe1bf358f SHA-1: eef49de9cd9240c8b1ef6bc6e30231959358a5bb SHA-256: ab590bee4dacd12688aa52eca529755cafaa81cd6c10d1a2bba3f26555355f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to compromised websites, suggesting it functions as a link farm or a lure to download further content. The presence of 'singer sewing machine repair manual free download' in the document body, combined with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', indicates a phishing or scam attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the distribution of malware via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817f1d1367a---69610692982.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/43c37254eef27d2d35ec103acf13a60f/28384213709.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942cdf7dcfc---92442971628.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9b1d2510---8037962635.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607266e0553c9---zizomex.pdf
    • http://fotossc.pl/_files/file/xipepakabosenogigafi.pdf
    • http://ankaser.com/userfiles/file/lodasevakonadoremonob.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e1b89fe0b02bc5d107aa52dacfa1fd5f/52210672986.pdf
    • https://bestofbucerias.com/upload/file/zinujixenakoteperi.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e7e4df67---74725146180.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796fd89fad5---fapigawu.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/3cd5dff950ba794ec714bb064ee244f9/50832481083.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jqtbiehrdq13si1vs1iccnvt74/69971400649.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef4ce0080---27557245908.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1592bcede6262ad8c240103baa5836e6/vikoramutaz.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b1pvm4ncsicge8aftg4e37t7o5/95398488683.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=singer+sewing+machine+repair+manual+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da48.bin
391508f00bc6d9ba02e325ec5983c19c9598bd38d50cce85491c729f6194fdfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 5568 bytes
font_01_sfnt_off0000ed0a.bin
0f9af11ddebc99c6084f855e44a054d58a5d2a7c7345ab95ca8e152efc339fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 10332 bytes
font_02_sfnt_off00011036.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 4324 bytes