Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b90db7d26096b8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 12:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66707c232e6b8286ff080dfd33b24cbf SHA-1: 1c43c10107ad72e7b6b9c989cbcae17b96f29f48 SHA-256: 40b90db7d26096b8b40027a8867ccb4e0c656ef3668e7bcf3df875e52d9f6203
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The presence of a callback lure heuristic suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=best+android+map+app PDF link annotation
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/fotibosexozox.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/20678038577.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/22192964763.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/bajapisisa.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613146eaed46b---gabawuxugoxapate.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kelerusaf.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/gorige.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/33635070258.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/27715568366.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/77644609266.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/fuzazuxavawi.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/bajavugepofurozubulilob.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/95367589009.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/gepakitopefop.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/sepevevaxurafozovopusevi.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/kikekitozokesarurademaper.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/32475857655.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cc8afc39f077aeefd6f371e615d8111f/93318861747.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/558b2c8cea7ad33bdba8e99a0d4e8f06/tezerelegupalatujurup.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/45178832643.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6163a4b2---6091410861.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p75t0mjl5n87s7uddtvi25irv3/luveruzekiwogesemexekezij.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/54015737383.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/fafugawufugitasuzozukaw.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/27966000475.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 10560 bytes
SHA-256: bc600e06352e4810b9ab1d44098c6dcc2faa70aa0db1e10f370e3dede3d9fee5
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 17908 bytes
SHA-256: 48abf38e996f4dabcd883249d96dc59ebce2e142caffca7026a52a7c344c7f3e

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