Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92ba59c9ca821da…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 00:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ef99f67cbada4b0158f3550a4ac2b91 SHA-1: ee14f0c95981a6625de78b24c768c586216ed5dc SHA-256: c92ba59c9ca821dace991498c546deb19c45c0ab06e7fab8760e97768bb6a58e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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.
  • 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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcc69ed57---4730425230.pdf In PDF document text
    • http://sportsgarten.com/editorData/file/71148405359.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210910_221105.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/128977228b3db922d6dfba7f95e20a20/29288118763.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/61831896513.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lasamoxutotanaxizolu.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/gurimegewewegosivetib.pdfIn PDF document text
    • https://retta-bg.com/userfiles/93556493427.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nupopabu.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/791a8aa2b8c8df49810c9ff9baf5dea3/30847866425.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/83020315332.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/mumefepitazawodusuruneke.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/guliwebet.pdfIn PDF document text
    • http://atek-ent.com/upload/file/64625179915.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/77444572503.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/5977350316.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/46733933184.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109160020503586.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/juwodadiki.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/futakuvonelivixorirogiwa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341883e8bef---pomigazutoj.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/zamomofekabewufisotu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1fcf853555d8e90dbcc2a138af512109/pesadaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=book+download+pdf+websitePDF 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_off0000bae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD300 10760 bytes
SHA-256: 74e3cd0921427805b93d37912e673e6f9cd709b3dd2b359897e76900381b695e
font_02_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 16040 bytes
SHA-256: 3b57f3cbf4f865c90728d37067c5ec6439ce25574416a47e6a1b37aa05847ad0