Malicious PDF — malware analysis report

Static analysis result for SHA-256 331d14ea8a260d71…

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 09:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 78a4f09e6ebac694c0497c2310cd8fb4 SHA-1: b0a5b01c1134ec79bb425956173e850107ae00bf SHA-256: 331d14ea8a260d710e13fb28e20b55c1356a3bd6f6337c5b5ce804c084c7ee53
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick the user into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a lure to potentially download further malicious content or engage the user in a fraudulent conversation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://techbis.pl/files/file/dugimo.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9ca6ls692uqahth4demf3lte22/rezoregekuxexitebopeb.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/diwapusawutogilevagego.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840eb52ac3---23666251547.pdfIn PDF document text
    • http://momsystem.ru/public/file/2869325721.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/18/files/44822253572.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/simamaranefo.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/lumuwuroxeparuvosifog.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4d982dcc098c3c360ad642280c830c89/25679193828.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/81590994862.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/46577330413.pdfIn PDF document text
    • http://coffee33.ru/archive/file/roporijadojevovofanolijun.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5328be01fca4fe05680dca155681d982/21790963547.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/pugowobos.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/kanikef.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/xudovo.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/giwojexajizogem.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/no7t54macshhsrdoq2rke6tola/zurepajajametavasevipo.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/53v6i86ukekdm5f4fa96ivrbn9ns25ec/68774002205.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb10245daab---99472735674.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/1fbkjhgdqa5795qohc3a1htudq/28217237237.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e80a0d62ee---zururu.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/vixadi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608414380c077---bevujepudeledogirofuku.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/14b14b7773d140d0adf063548cd63e90/xeviluwatugemitexizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=203k+draw+requestPDF 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
font_00_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 17096 bytes
SHA-256: 7d314a7c1f6187db7d409265edd453a377c599fe9056af2e92429fd2f1f56556
font_01_sfnt_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00012ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF7 10620 bytes
SHA-256: 0ef228cf32080bc63606a50da3a31d595684c84c739ffdabf7e1d9362ed3a138
font_03_sfnt_off00014861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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