Malicious PDF — malware analysis report

Static analysis result for SHA-256 75473e2a72e86753…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 22:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fc05f13e136f15848d4189a8762b1dac SHA-1: 550361783da51ef94cf9e3680a920fe4cda8ea99 SHA-256: 75473e2a72e86753bbaa3a10863b0a53aa08bfabce63ec582133d9abebecd891
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure with embedded links. Heuristics indicate it's an image-only document designed to trick users into clicking external URLs, such as 'https://crysiq.ru/uplcv?utm_term=honor+of+king+apk'. The presence of multiple links to compromised CMS uploads and disposable hosting further supports a malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=honor+of+king+apk PDF link annotation
    • https://traffictkt.com/viking1/uploads/files/56704054045.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/bepofokazidozowugimuvawos.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021912459556743.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/85206450183.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614274c6444ec---18992982097.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/tofujuvibibetofonepofup.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wibotusilaviwimaxikivuw.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/60661579331.pdfIn PDF document text
    • http://namngonviet.com/user-/files/9901014646.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493fb4e63ce---kofutexopavizejiwo.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/jiwuderozerivenutuwemu.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/gedos.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/71836401514.pdfIn PDF document text
    • http://mfcpavpos.ru/file/99208983868.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/52fb47ed7f2a8d2f46fab4975040edd4/66758120756.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/95703195514.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/tuzimidupifa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134fab5cfaa8---9282173032.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c845e8997f---mokuzunuzobob.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/76731495704.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/zaragemepuzuruxuvuzexizu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/4800464522.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/gipupopidusirijege.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/mekamebubifono.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/77701654586.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150263f7418a---risojatigibulofulemina.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_off0000b18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 13948 bytes
SHA-256: 2c64b64590c654a125546cba8ae2786351774eb44e6fd381b8acd2971432af79
font_02_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 10172 bytes
SHA-256: 078f27071989dae6c3ee91458b3bb9e168b1dcc8aef335fb5d8ce963f3f99324

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