Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ffa893a9bfd149…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 02:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90bf013c10a23b15f3995cafd9a758dc SHA-1: 3dd11471c67e29b0445265e46dc60e3576cfd884 SHA-256: b0ffa893a9bfd14929d1481c7b85b058e74a3a496d9ee81b884ec99402833ba7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites or engage them in a social engineering scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.videobezopasnost.ru/ckfinder/userfiles/files/jerugojuniji.pdf In PDF document text
    • https://vinatech.com/userfiles/file/suwogil.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/nudarug.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/wanuriwadunibiwajasowul.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/10482684951.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/f00a37dc36a32905cdbc0264f303d2ea.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/65194224316.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/kipesux.pdfIn PDF document text
    • https://wasael.com/userfiles/file/naxujixobojenikadukagiron.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/51419803978.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/xikoviz.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/58789702756.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/19562155865.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/lokonefisezekagojapa.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9a065b5d---86569103794.pdfIn PDF document text
    • http://canvangdientu.com/images/file/sokikutokigu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/99209717336.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/7587643168.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/xapofup.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48822631475.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421bc513867---jikaxuzenabagukenoj.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/94e8fb6382a2692bfc0f40189b19aa75/69240751951.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/91981426859.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/24370164802.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c2b73991---69181443496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+remove+clone+apps+on+androidPDF 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_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 17564 bytes
SHA-256: 3d0b76e28ae184b03c500bd1e54fdeda14174b92c225b75efa566e0621fd2459
font_01_sfnt_off000118b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B0 10820 bytes
SHA-256: ddb37e1e9c409bca10ba5f976108470e65cd2cad3dfad8b2e54bddcca552fe57
font_02_sfnt_off000131a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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