Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdbbc39f046cc8b…

MALICIOUS

PDF

106.9 KB Created: 2021-08-14 20:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a195d9ba0f68608435ca6f1fde40a563 SHA-1: 24090908a6032b73e6d8e21ace1a50b61b8096f0 SHA-256: 7fdbbc39f046cc8b3dbc4ff2fec164c93d8b72e8e9ebc8430e9cb77cb27d892b
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links and the nature of the hosting suggest an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://poultech.net/d/files/bokomasugogoju.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f62bfb46a5f414173a459fbbe28ced3e/luguxububazoneridot.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/f554ea2929255ff754c39b1d7d0239bc/90855485586.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200789834363.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a715f855b9---lituxabuvonipatuxa.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/24291325698.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ul9cuum3hpuk73780u1aj4rosg/vozogonuvebuneduvaro.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d4a78c50---fakavureginowugitakedidi.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/65002329377.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/79555081877.pdfIn PDF document text
    • https://fratellifurloni.it/file/donunigebobutewodax.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/mijoleravomefixev.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/xujugazuwutotamavafefa.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/77323853526.pdfIn PDF document text
    • https://inifd.london/uploads/file/rivosopurojitakalorapo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66809c4b8---34359929758.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/29593835348.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/mebifaremijaleridebikudom.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c718bb9dfd---36461094844.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/s5nddcj3dbsim2lrjvq0vphnr4/42313981418.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/xapeniju.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/15796355133.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/87558497949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=telecharger+anime+slayer+sur+iphonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010a7c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A7C 30812 bytes
SHA-256: f2a432d9fa18373913ff2d1e4cd418f72b42562e3c6b20c424610d03522a54d9
font_01_sfnt_off000140fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FE 10900 bytes
SHA-256: 85455ed43a3cf7c6618b6af82b1a3227f9dc992124d579a579534e0523df0126
font_02_sfnt_off00015a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A08 16468 bytes
SHA-256: 2cc4e51d6460a7b6ab47831893fd672095a9cb72a1a0376ca8766c64cd4e1e27
font_03_sfnt_off000184bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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