Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef692a3598932150…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 01:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ab429e4aff2ba4cb166b0b24ee789df SHA-1: 3fe59ddd3414eca7d22896a44b02c9e6a8c61738 SHA-256: ef692a3598932150fd87ca8a8807e68fcba47fe202a3ad05f6a9bbfb092ee6b3
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic and a high ML score for maliciousness, along with ClamAV detection as a phishing trojan, strongly suggests this document is intended to trick the user into downloading a malicious payload. The numerous URLs, including those hosted on compromised CMS uploads and disposable hosting, indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=cow+earn+apk PDF link annotation
    • http://hkbroadwin.com/userfiles/satumuwavuvurinujame.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/vujuketu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cf3aa203a---30970889225.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631818388.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/riwejilewudejogasedekuge.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/sefarimimaxaxuteb.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/lopifimulapatefuvasomi.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/26557446281.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/jenawineleweworazatuzegiz.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b7f091a8eb67edb9876f1cc79575ff2a/funejoma.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/46801944061.pdfIn PDF document text
    • https://stvorki.ru/files/file/16447521064.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/pitijesagexemilob.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/66596744188.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/taxorokuvu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/rijasexinodode.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/32677705384.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/dowobojokaloni.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf04812e8d---xaremasotetisol.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f577a38a---lujunavujobepizofuwe.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/43193652281.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/74094912062.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/sisofasefojin.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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 17832 bytes
SHA-256: 8ef58add9b7c5c9fa04fa53a4061c8ec2755262f7677814c1495e6ba9a932745
font_02_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 10048 bytes
SHA-256: 55ed5bf9bb8186a13a17bd9370258e8d60858ee858b625ddb5401d97297fa83a

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