Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cd6e1293252266…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 03:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02d33abb9f9c6b439045a124851f0b74 SHA-1: 873cb4c9e196c6d16b6a626ab793f66fb3161112 SHA-256: 52cd6e129325226682421456a79bfd18dc6c2e0878cda054abd9524aedfc7bcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and link farm heuristics points towards the exploitation of users seeking content, likely leading them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://oniceh.ru/uplcv?utm_term=hacksaw+ridge+full+movie+putlocker PDF link annotation
    • https://nawaasha.org/userfiles/file/kivikikunuvamitedogib.pdfIn PDF document text
    • http://merwepizza.com/upload/file/nolegewun.pdfIn PDF document text
    • https://sanagustin.cl/files/13242073469.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/mixatuludutesixida.pdfIn PDF document text
    • http://zatacorp.com/upload/files/34687496696.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090801272667.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/buvilibabukoweweviragobor.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/27064656997.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9df958706518d916cc004438f9d6b04e/zurikobikutumoxegavokeki.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/luzofisajogabuvowaweda.pdfIn PDF document text
    • http://eternaseguros.net/files/files/dufavadafekemovovidofagi.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/16714650706.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae7c524ee7---54058331150.pdfIn PDF document text
    • http://fabtur.ru/upload/files/4362295980.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/dakapojumulovon.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/wonidikipazaxizaxokapozoj.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/rukavofu.pdfIn PDF document text
    • http://viorina-deko.com/images/file/78759026253.pdfIn PDF document text
    • https://egf.tw/test2/images/file/vojirolasidej.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9bba23a6---mimefibutuzuzin.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/17762782912.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/26150564592.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vatunogaw.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/wiwasi.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/4211182332.pdfIn PDF document text
    • http://jfe.hk/userfiles/3781752862.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_off0000b984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB984 16032 bytes
SHA-256: cec94e4e5496ea8c43c561d1559e6ee0cebd21f78e8db28b565da96743958950
font_01_sfnt_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 11192 bytes
SHA-256: 7e4b47290ce8d1828014041e86c80d7c4866fc965b6cd33e722e9a81ac760371
font_02_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1