Malicious PDF — malware analysis report

Static analysis result for SHA-256 03987853fe4cf5c4…

MALICIOUS

PDF

88.3 KB Created: 2021-07-23 10:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7a9260a521459d2dd58f2b26ef1a7a5f SHA-1: e9361d8e09a0d50e63ff587c254ff099e3f354cd SHA-256: 03987853fe4cf5c40be8c816057399751cf45aab2e98b3405043f67c1cf4d9de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm and a callback phishing lure. While no scripts were extracted, the PDF structure and URL patterns suggest it is designed to deceive users into contacting malicious actors, likely for financial gain or credential harvesting. The presence of multiple URLs hosted on compromised or disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://fullhousetourism.com/UploadFiles/file/20210523194857131.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862eb45ad30---53419274551.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/8657526524.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b7848d810---43597708199.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1fb68cff---64563860999.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/21421462120.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47acc0cc89e0b4a9ba5299c275be4e9f/jilivobipadofikowux.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/60663821281.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4cea661f5e3078b22eac85ea02451508/migusijumidudugetujo.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ktc042ap1jlph2gtrpsskd01b1/lolagunodidajeganaxepaw.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lisaxiguzupogur.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hflfv1h6t22nl4k51jhu9cn7ap/zawafubilonevapetav.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/16178945563.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d0432234b80a4b33a1286d0c7f4257d4/buvamewaletatet.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/luketipi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9cf5b86cda7c15ae46ca9d593653ccd0/11891050845.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a1949b5ae6b5f685b287f5333e9deefb/soteginube.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/gifopuzerederamot.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3ca370dc2---43214613105.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc3992420---89651393305.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/5ch1oeam0a38iq0ldara2llq8f/85086347052.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/73055723370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=continuous+compound+interest+calculator+with+stepsPDF 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_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 17200 bytes
SHA-256: f88de3b9511c22091e56495faa697048a2fe906b3cab03d2f3a9f1e5796578a3
font_01_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 10996 bytes
SHA-256: 16ea80fe01e56f9ed27a5e6eff63461f278c9919dd889b99f97e1272b980728c
font_02_sfnt_off00013b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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