Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb64debc219e38f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 19:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c10b10c1cab778f684c3bd4836782df SHA-1: 65897bf63c5c67e516b2a691cb3a64e631d70130 SHA-256: ddb64debc219e38f8bd01a6842cdd530fd136c8056dea3649d8d0e586d5098df
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which are part of link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The heuristic 'SE_CALLBACK_LURE' indicates the document might also be designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=incisiones+apendicectomia+pdf PDF link annotation
    • http://amphorabeautyclub.com/campannas/file/55203738053.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/71746376065.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/57532830250.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/benamodaxegametik.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/tukowajumazo.pdfIn PDF document text
    • http://designfromall.it/userfiles/file/922477301.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/61164276363.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae67d0d40---rukoli.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210823154816.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/vozabozi.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/wigilabubuwezokizenoruwaj.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/12678516363.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210816_281DAF7395A488DA.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff063a900---mizek.pdfIn PDF document text
    • https://csn-alliance.com/data/files/85364467957.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/gadasobovobumumuwep.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2238af11b7ded65b591a25fcdd2b9cc6/89838822741.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/fubapobodulazip.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/t6nlogmasou7r0tm0p85dfpusk/55723326596.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/94058031504.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/75534535071.pdfIn PDF document text
    • http://asustainable.com/global/file/98106371002.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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 18416 bytes
SHA-256: b0f0a8f5ea4043f823578600927157c8b33f34556da59fb5ee039e40fc186f09
font_02_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 10584 bytes
SHA-256: a1cdeeb0170b95a7920caf0415846955abf571776eda2aa33a2a0823b1c9fe85

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