Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc34b8da3384a5b…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 17:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8635b6901831ea9a86176f2edb2ef365 SHA-1: 80a448690e768c61d13a389f6d1748552240cb2b SHA-256: 3fc34b8da3384a5b96e627399bd839ea40b5d1e83110f20b9ea22ecf6bb87c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous external URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS upload storage suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7dcc6c4f2---jasireditopafaleburoz.pdf In PDF document text
    • http://hungbuloon.com/media/ftp/file/47395504570.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/49739703711.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e23770d9cd6007d7408c169bafc60e9c/30820829203.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbec02f696---tigusavuxonefuvomakokuli.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f09b92a3d---89386162144.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072e659cb26e---42137880491.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vavos.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/61914568117.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1b6b5bf343dc067bb08c71c08b5ab82a/jewevemaloxosurogo.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/kavaxilun.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666245b826---vagawakoma.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6f1f1d2fc---75113651618.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4effcb508c2a859b5b821e4a13495bf8/65626815358.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/66149896320.pdfIn PDF document text
    • http://cwesp.biz/upload/file/luzaxizexuxefumizajon.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/ad5d98edb4988f018454c5e3ba64edde/mafigeripafofuzuligejaw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a5a52def2---tegomapadaritakopijuxajep.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/gumizafitidanofirab.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/22487062365.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/nejokovuxotarufejeba.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/a04ejbtsc5l894j2vjl1v0ob55/jajaxulugokunoxazumumu.pdfIn PDF document text
    • https://avenue102.com/uploads/file/44097680873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+does+ty+mean+in+text+languagePDF link annotation
    • 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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 10904 bytes
SHA-256: 841b595131da9e11acdf7619fc925dc9978779d25c30f604cd2672035d0cbbe5
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 17276 bytes
SHA-256: 62cee8124a53bbc1ccf5645fe0d1024b3d83dcaaa5ed2dfd9189f2f54b026705

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