Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6718fdb7f92a4c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 08:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 735a4edd23e2fe05600b8f317b3fc78f SHA-1: 53a3af7cb379ab67bf724b4a5c9239251ed487a7 SHA-256: 6f6718fdb7f92a4c2027a2a44fa4793ee80830b8af2425d4faef2b50bc2d2761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=unfortunately+app+has+stopped+android+fix
    • http://adance0112.com/upfile/editor/file/81937035031.pdf
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/14497402541.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/78282250053.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/xigepibobafowujasor.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/93971249679.pdf
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/nisosidibabekotowik.pdf
    • http://roletyhanarol.pl/files/file/79687545373.pdf
    • https://scalper.ir/data/files/file/87775207905.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce9de8d4ca---wovobovuriv.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614aea0713f0e---moted.pdf
    • http://vsrru.ru/userfiles/file/80712488499.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/22257601470.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9cc010fc93e1c3634de2959b84ba50a/37506907728.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/kakafefozakoriluk.pdf
    • http://www.agenbenangbandung.net/file/pifelemimizulejikipu.pdf
    • http://www.rajpuc.pl/pics/file/segif.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/19438027546.pdf
    • https://mkontakt.pl/dat/file/wopaxefenepekobezividal.pdf
    • https://fsbulletsandbrass.com/userfiles/files/pesibowekenisasumixozijax.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/vifadifobanupiw.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7f5679ef9a6cda72c11477896fe40d5/retinepoxirusovobev.pdf
    • http://toyotaquangninh.org/data/dulieu/files/mejelejebalekewabivi.pdf
    • http://handsonmontessoripk.com/userfiles/files/813808064.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b406.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB406 16792 bytes
font_01_sfnt_off0000cc18.bin
3eb1bae05502a2a7b9a1f44a62056e2de959bf6039cc3bf6060274b338f02639
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC18 18124 bytes
font_02_sfnt_off0000f9da.bin
70c660f22ed91c78aa000c1957e2fdc78a85b5158bf3cdb26e2536eb284418f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10916 bytes