Malicious PDF — malware analysis report

Static analysis result for SHA-256 a393bb6d11ea1c8b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 18:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e7d0df62135db0d92efd9a54108cafc SHA-1: 86ee6e20fc6390df8c4ef5e93335918e754ea738 SHA-256: a393bb6d11ea1c8be0b8fa4403f9e97b7847d74e8e2377fd431e2c95e30fe041
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, suggesting a malicious intent to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to prompt users to call a phone number, a common tactic in phishing and tech support scams. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=erasable+read+only+memory PDF link annotation
    • https://tort-art.ru/userfiles/file/6534643702.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/ligixesupojatajijagulod.pdfIn PDF document text
    • https://tomas-music.com/contents/files/bujobimekikesevurowiroki.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bdbcaa41---69850080048.pdfIn PDF document text
    • http://machulski.com/public/file/84497461493.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/15069835128.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/kolomazodi.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/91652147808.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/muwezoxifeta.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/28135188605.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/fexakapam.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/bijikitobo.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/dunozevelo.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/rikizito.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614199bdb8f39---62912678298.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/zawuram.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/zeruwofazafutij.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/ziruniruwizolofo.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///zegedupoliluzunofotiwim.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141232cc629b---xarupopoxipifosaninu.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/23393092746.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/gifijaf.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/josufovilazavupemufax.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 18360 bytes
SHA-256: 0e417b12623bbe811feff67e7cbc08b1a8821b8664cb043331fa066f9017e55b
font_01_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 10456 bytes
SHA-256: e337aee10f9d309c75c0eef9a2bb1f3ba474d418d4c8336dfece31fd1426d2a6

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