Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea5cae762d0967f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 00:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a08bab22588c847dfc534464b66a34d7 SHA-1: d70d25f5699944f07f1140d226e6b240920fd29a SHA-256: dea5cae762d0967f498c4fbd2cfeebc373478630dfc4f432258326829195034a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://cructi.ru/uplcv?utm_term=index+of+boston+legal+480p PDF link annotation
    • http://sooam.com/files/fckeditor/file/207278247061386c47d1626.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/natakunafawovelibo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tb60puj16bt5hcp321j609qb2n/99029030270.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/wonul.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/pamazodokokuvopek.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f5594af8a0cd79f6eb098f071f816297/silejofiburiwasexufupipab.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/vejijaxelusoxogolibexuluz.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/limituvejat.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2d2a9b78f3c64e80aa7e00c314bd2ce1/58557578157.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/bipebitikilom.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/fariweposeseb.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/pepejunoroja.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/37168920768.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/30513808230.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/47176662189.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/fufitozegixurusorafanixa.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/pawiwuresex.pdfIn PDF document text
    • https://onlinendttraining.net/files/manadoxutusoze.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/tekasuzabosobozegozino.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913151354.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/74191451689.pdfIn PDF document text
    • https://sanagustin.cl/files/gilupomazimuvibumunokeri.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/bibapuwiz.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/daveduve.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nagudetevi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319ac1f3865---86380262698.pdfIn PDF document text
    • 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_off0000b1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C7 11080 bytes
SHA-256: 5d831d617b826c37a28526c11ce8735fac260fc90eaf8eec6e5543eea886dfc3
font_01_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 15576 bytes
SHA-256: da88f6fc18b5c1db136cf7253ff76ebeb88104fc27fa32adfbd4134a28649c55

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