Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b2a20266f840b9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 08:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03c8e85379f95fddb6d2130b0436150e SHA-1: 8b0c46e5d70846503ef24d0ea0e81813fb517e30 SHA-256: 16b2a20266f840b95b9356d21c818831ecb138f683e41e5036e056ab4db5540c
184 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites. Heuristics indicate a link farm pattern and a potential download button lure, suggesting the document's purpose is to trick users into downloading a payload. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=manga+bible+pdf+download PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b72b2d4326fd5a29fb612d7e1e9c69b3/32642992591.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/betavapagiriwalifemod.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/xurefonoselaza.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2a1ed01e---42989507034.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/mivomepedotujefomelaxula.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/todilazaxalasexelejuwa.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad372a79f---dutegezefajavazinofomuk.pdfIn PDF document text
    • http://www.heksan.com.pl/file/38188367247.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/difuzorofelawaluvi.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/bizuroxalifogudamo.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/makigolu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8aa2d786e8721c86435e740808abd8d6/zafabudo.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/luxujudivukidafo.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/35831261748.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/nuzefunozo.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/terukefuxelosoxeg.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/78378343162.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/volosonivo.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/59105423984.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/8663200154.pdfIn PDF document text
    • https://premium-house.uz/images/file/jagorojuzewevalibit.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210916110529_ig43ds.pdfIn PDF document text
    • http://gysanya.com/upload/file/210909173758633722oscv25ozmrdb.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/tedere.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/vopimegobakin.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_off0000c525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC525 16848 bytes
SHA-256: 63f54fc2db6aa7bf4bb9ffc1ac88a1dbbcca1f8eab41976e23181186708a1c89
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 10524 bytes
SHA-256: 7a31b3aead8966007e96c574492ceec81660e07a2268f10052100925874c0a7d

Open this report in the interactive analyzer, or submit your own file for analysis.