Malicious PDF — malware analysis report

Static analysis result for SHA-256 396dada38926642d…

MALICIOUS

PDF

106.5 KB Created: 2021-06-30 12:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd26b9a756d670c9e37ef90a9cf10a66 SHA-1: 43ef5b3f14a81d5f606d555d7ddbac41d95aa59f SHA-256: 396dada38926642da6991b810ebd25a125e72b7e93ee2dc8c4d35313a285df22
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm and a callback lure, prompting users to call a number for support or to resolve an issue. The embedded URLs likely lead to further stages of the attack or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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) or Microsoft license-boilerplate 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://infrive.ru/uplcv?utm_term=be+a+good+steward+of+your+gifts PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b93c4032---27796895811.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d59bb098dc389c8302b4f5d260248b9e/roribejolavavezagexar.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da65ce7bc64---vudoli.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a535e9940044d41227851bd0c8c7230/rujimozepo.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/jhu3cgk9t2o51916f0l2tks382/18110982611.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/92cc0a0d1fea35cf47ca894223dfea62/63757171267.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/logikokivon.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/fedekurelebu.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/sfiil4q2tf20pdl7o30db88b47/damatulabifubutowesiwowa.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8a4d250de4bcca6f3fa79ebce75fd2fc/47212513739.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/zixobeduluduzimamamuvop.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/9km1u203uvogdl463or1c69tu4/59187057789.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/fa8b4c69e82a73d4372f9f989230962a/gewofevapirodo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607389d1926ac---jebedoxu.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/e1800906a8b8452a64b1a33e730c8c30/lekupofuvuvugevofidi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lampghb7i8cfhdpqi5a2pv12ve/92835457933.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4d9a3842---16060142227.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc0d55f32---vofojumegagufekixinulida.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28db64f36---89130280048.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/d2e2a0092244e48d0081f099eee31453/95028790769.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/67648436509.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/wanenep.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5bffce736---laxazevunitul.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/46862670451.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_off00013cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDB 10732 bytes
SHA-256: 85bcb0342d32f45f4c1555565c5dd7b4e3a35cbfb4db4101b3476df3716dd9b1
font_01_sfnt_off00015593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA5 17888 bytes
SHA-256: f4c4ece94219e85c8ddc8bbcabdc0a98100b704bcfab8d5a82c148e65705a68d

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