Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22f8cb70e49e38b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 03:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af8a0acb34709f1526861ca129affef6 SHA-1: 7489ef834fb00d6ba92e3c595087f6bfefa55a6d SHA-256: e22f8cb70e49e38bf84f71a08579a4bbed4d6f1d88bc4d896ac65ad73dc8dd15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The embedded JavaScript and numerous external URLs, including those hosted on compromised CMS uploads and disposable domains, suggest an attempt to redirect users to malicious sites. The primary function appears to be acting as a link farm to distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://crewmak.ru/uplcv?utm_term=rick+and+morty+123movies PDF link annotation
    • https://topinsolventa.ro/userfiles/file/dakaganuzewikedim.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/pejurotoso.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/19566224901.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e8d906ab---46967835692.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/86324452fa386356db0665b8851e11ae/munul.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/41338031972.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/ridevekudifogikulimovaf.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/27632669196.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/86438487456.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a649d48f4---99903830110.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/50314471200.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/duwudirexakijabuporovo.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/viwunupegagapipalogu.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/3477334595.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/lefusu.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109091824064915.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/kanaberulabigala.pdfIn PDF document text
    • http://modern-pro.ru/files/file/8521974413.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/21242583363.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/58761910266.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/subamufobodifoxegu.pdfIn PDF document text
    • https://themalc.org/files/file/13901103495.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/84750415214.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_off0000c295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC295 17472 bytes
SHA-256: 4ce66f91510a9c6446dc3fd720df6efdd080ccecae9193b6e06cbe5efb05ff15
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 11148 bytes
SHA-256: 58848d4b5b33afc5ded5255c16eb841d26814ffd3ceb8a2e1fbee18aa2d09a55
font_02_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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