Malicious PDF — malware analysis report

Static analysis result for SHA-256 645f0755dcb302fd…

MALICIOUS

PDF

70.1 KB Created: 2021-06-23 03:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78421323680bc5240429f76eaaddfa1f SHA-1: 83ccc23f47b2d99eb56d972a256b37d38a8399d0 SHA-256: 645f0755dcb302fd27ba92680715544af1e61530c96f82976d52ef0568d5898e
184 Risk Score

Malware Insights

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

The PDF is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute further malicious content. The document body, though truncated, suggests a lure related to a 'notary application form'. No scripts were extracted, but the presence of multiple compromised links and the overall detection profile strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/cf988ada5e37daf8a6c256f0b0e85633/dibuwa.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/79421603484.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b03f48e5d---fubide.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/hssfatrmkq8jdrqi12a68tmsfp/91576869533.pdf
    • https://kodcomputers.ro/2664/uploads/lifezimawatikoxipapitaso.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/74094566519.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/17139d20c3478a54fb4352a51e3a2cd1/tujemapowu.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/s1cgtnl5u7omjns0laccmba8ej/pepigezalesiguv.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/dfff82dd3899a8b9561a2cf30e308ead/renomovujudiwiweniwu.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608daca8f1c3f---wolixodosinakagogev.pdf
    • http://nexxosrealty.com/userfiles/files/zebuxomibozaseg.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6f5750b6b7faea6e2bebd04519c13fd7/91389727919.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737d13ccdfb---55612570588.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9aef5e02b---kanajorutovasukorosijo.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb8f0fd01---42797931459.pdf
    • https://hasekei.jp/userfiles/file/nilakolo.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2c5a090c---masudavigenufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=notary+application+form+pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d1.bin
0add8b2d5a4a1efd47f0a554249617cbc9789b8158c35b6794fc0df2ec09f7d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 5192 bytes
font_01_sfnt_off0000e47d.bin
8d23e19cd36076e4786d29a5aa27b7a73850f90cfd741e025ae57b0ce00f7206
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 11828 bytes