Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eac792e4e069274…

MALICIOUS

PDF

94.2 KB Created: 2021-09-05 07:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40f2d59c3f24a4e8856b77d235fc4a49 SHA-1: da7f1e17b7d6938bc57619df28b6cce9584a126c SHA-256: 8eac792e4e0692747f8c8a54377a16fd17add212df1952786d3dc9a515820fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and promote these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=ph%C3%A1t+%C3%A2m+ti%E1%BA%BFng+anh+chu%E1%BA%A9n+pdf PDF link annotation
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef744f0c4f---zutebit.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/ganesilimamiragufonufive.pdfIn PDF document text
    • http://temple.mo/userfiles/file/tifukuxoxawuni.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/boxibukotolow.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/namon.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6he5rtbb5kpv7sraoljcsu1ni1/jebalovuxogudo.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/18714763277.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/gofaz.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/50947558216.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/sfntb6vmg0tsvi0dffaros17j5/30774905842.pdfIn PDF document text
    • https://ags-car.com/upload/files/89635256327.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/voxizemikak.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/98865310102.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/balale.pdfIn PDF document text
    • http://bienbao.net/uploads/files/xujiboxerodizi.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/0jre6duh1e19adjrcpk9hmi6m2/95518511437.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/zenil.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/juxomalinavuzedusov.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/7709584256.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/42978617175.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670d503fc4---92613468595.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc986dd1608---pivowotuzafim.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/60553423720.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_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 35160 bytes
SHA-256: 3c73b350412125c2069abec5c7fc5fc5df52e7dbf8ae9c8f6879565a4f217c6b
font_01_sfnt_off00013761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 11408 bytes
SHA-256: f00d5e535e73fc1aae160c702ba5461e41c278d2edcc0309b1950b65c08aa1bc
font_02_sfnt_off000150b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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