Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6a7b9065fff704…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 07:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbaeb8cd231e5ef84d16164af4c46768 SHA-1: 363a763f4a3f1bdd155034483eeadd004a3a131d SHA-256: fe6a7b9065fff704280f77db27765ff3abd0c2e96bacd1bf1b909ae69d5197f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=mejor+aplicacion+astronomia+android PDF link annotation
    • http://quincy.pl/ckfinder/userfiles/files/zolapakiwuged.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/mubofajewim.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/golebodigoweti.pdfIn PDF document text
    • http://hkalc.com/userfiles/83722925867.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/mariwejovolib.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/zemetofujukotapuwutubozaw.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/14733135654.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c867df564---36382791718.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/74574702436.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gewifijuwinenaz.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/51964331682.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/razugobusemavejowofosepew.pdfIn PDF document text
    • https://jurad.eu/files/file/zifobeke.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/36727414814.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/fokovenojaxusizupol.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/537d650537cf26f0f0c8f85e01194030/fenomijefu.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/mixubomu.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/28446281114.pdfIn PDF document text
    • http://kite-surf.sk/files/podawuwijikuk.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tikogumefupuzapadiwijalu.pdfIn PDF document text
    • http://chinalabware.ru/d/files/93459885546.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/56332521284.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614305dca8e94---84571323874.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/61870464852.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_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 10796 bytes
SHA-256: 2f5e8b957b80eff43acf9a07ffb7fc86a0bc08974d89ddfed5b8c2d39d9c3bc9
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 19184 bytes
SHA-256: 841f954bfcfc0a50de2321ce837bd5d57020e866307351a4c6ea80be65df712d
font_02_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1