Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b10c2fc260d7a9…

MALICIOUS

PDF

88.3 KB Created: 2021-07-20 20:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 244217edcd084e94457547b80c5d1b4e SHA-1: 7df0a187619558f6bb0a11e18dc17ca5f7251199 SHA-256: 16b10c2fc260d7a960990f50c1a99e884d8d0f1e65ace71127e72e20200f979c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a callback phishing scam. The document body is heavily obfuscated, but heuristics indicate it contains a link farm and a callback lure, suggesting it aims to trick users into contacting a malicious entity. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ctsgroups.asia/images/file/karojavugebafaxevafinax.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e82499305---1939306464.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/puwemovu.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/feviguvak.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/falige.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1339d370f---vapojuluga.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nenowufoj.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/bc633952f1ea38a91e98a35ebf0d4f2b/57571182651.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/36613157909.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/rodozeke.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/88933764322.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/95425f388fbab117d70eba892308c197/47382083240.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/ronimezerigedesijun.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/wojavuxekiro.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608011e144a46---xulunotuparidumasariziwaj.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/uvolaoc1djl60pjdjqdouvff8e/68592692678.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160830dc193303---rusega.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/45671248769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+giver+lois+lowry+book+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 10872 bytes
SHA-256: 95881b23bea4b24917b1060540b6d7c2f87482138af69c2468c7eefcd9831fc4
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 17220 bytes
SHA-256: 72eaf70c6a3c0ae69c0bde3779755f5828576fc9ec671d2367b5dee9cdfd5123
font_02_sfnt_off00013acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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