Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda22975a3ff60f9…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 01:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05f82656776aae61a4b41501f839a022 SHA-1: 519ede2bb6ce6707d293ef20543ea7a93ca9fae6 SHA-256: fda22975a3ff60f911af63f0f236c451fe6d53010b7c0c13764c1763e7242a9f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure as a link farm, coupled with the use of compromised CMS uploads, points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=infinite+series+calculator PDF link annotation
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405985bc6a2---bosanexijabadezepazula.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/70981590046.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be81d19de---52525663159.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/66024599904.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409c8def02c---41195368512.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/24156430616.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/58693684753.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/pexarinutej.pdfIn PDF document text
    • https://aspirans.com/files/file/pujaxowib.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614130665dd15---21625486125.pdfIn PDF document text
    • https://adci.vn/data/upload/file/xolesobafulavakajif.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/sizuzorozoviwuwavu.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/pibinizotuxosa.pdfIn PDF document text
    • http://www.centralperdana.com/file/55051576441.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/zofadozudetebuvidibe.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/63074935409.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/zeroberodofibagagomevif.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/37248230017.pdfIn PDF document text
    • https://longhoang.vn/upload/files/72765450511.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/ratawofaxumo.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/nomobibejavunolajuwulefaw.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/67d449865f190fc7a4e2fbff1fd164d5/35362317426.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/wixelo.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_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 10380 bytes
SHA-256: eafc9c56651d5c6cf468867f44d94bdde2e71bb45460a13251cbd6b2456ca20b
font_01_sfnt_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 19092 bytes
SHA-256: 351a7c5b7a79d942e381c0711d0d563a2555d51f99a1927831afaaf549bf8463