Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4fbf1b926b0ed5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 13:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 755e77cf2fcf526e84f8ac0d6c704917 SHA-1: 1f7ce061d51897ddc0d3cbc4d66d1ea698bba1f8 SHA-256: 4d4fbf1b926b0ed5368c5d750f9a7c316c3fee292fd82b8c0d71bd2ee2977ddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. One URL, 'https://infrive.ru/uplcv?utm_term=raze+3+hacked+unblocked', suggests a phishing lure related to a game hack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=raze+3+hacked+unblocked PDF link annotation
    • http://optimaglobal.net/ckupload/files/vudogaripeledi.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/7553192953.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/xobib.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/junoxod.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/warinetedafedog.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614168399492a---22964473152.pdfIn PDF document text
    • http://kodemari.info/data/files/20633170433.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/daporejulinekev.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_EF8E5929CB5A2471.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/jerukixoxumu.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/rakuz.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/cda036d20b7ef64cbc8879ecdab73704/nodenamerizatib.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/furejevenewowe.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/ruteb.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/zetexi.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/fezesaxubelapalexoji.pdfIn PDF document text
    • http://deauville.ru/files/file/xojija.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0is4hk04ru0sa8fmnikoqvsae1/betojaxelorosimopuximomul.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/53927585155.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/55005074908.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/89915906200.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/79188427408.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a0948d0cc93b752c9005e9a38691f356/50500739767.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/visisojugokuxunob.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_off0000bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC35 17316 bytes
SHA-256: c4d5117a98652b18f940808d580093acbb15aa286ce54633bf0a4d796553e745
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 10620 bytes
SHA-256: 106675743365ebd966aada34c19ff0019ff6c09793bc0d03241d808560dbc620