Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfcc7c3dd05b993…

MALICIOUS

PDF

100.1 KB Created: 2021-07-26 07:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7c593abe32808576883568a26da14b77 SHA-1: 072bee3874255fd08e4aca701752deac439dff71 SHA-256: fdfcc7c3dd05b993847d2cfd4cf86154b6a8005c141b1972b96f227b5d82e5e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79af37766---zorizatitorane.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094490cbf2fa---52478364179.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/91448410096.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/70789289214.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0c40c847c007c79fbd75c591c5e27253/diwukusesed.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160741ea29d86d---xibos.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820ed37f214---10944833944.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/023cdbc3beeccbdb8b71fd51939a7b59/83974697749.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kokafikodusomiji.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d62882dcc95d5c0725c9e911be40901c/jubewoponafaro.pdfIn PDF document text
    • http://brukbet.com/user_images/file/tivubuviroxan.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c439a3c7895---viguludelivutitakinarukar.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/vemuzifepixofi.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/4727495520.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/44134514373.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/birurumesawati.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/likudasuxaradane.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/4933f5e6ab0923ec24182836832e88dd/64619301911.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df3524d3c49---vagewamofaninukomafimu.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/radivifilekufuriten.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4599c69c0c06eed88b3c31a468ff5536/36334584464.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/40d63765724ea33c38e09f1bbdbbabdb/97062973527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=naruto+senki+beta+mod+apk+terbaruPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00014898.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14898 16444 bytes
SHA-256: c4c026fd5ec1cf270c8eecc8bbbf01d36927158cbc27878eceedd26e9e6b7996
font_00_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 20500 bytes
SHA-256: 25434d1697f5fd2f7b0c04620cc3707743285e6a65424c508179d637d9f77be0
font_03_sfnt_off00015f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5D 10816 bytes
SHA-256: 621ab7428e04c892d9b00169ede883bc86808afaf9d1a49906ac4788d299de93
font_04_sfnt_off00017811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17811 1936 bytes
SHA-256: 866d7f93f6ccc5a6f7faf50f8f13a3a09846bd5bb7e646d0b1e0c629637ea959

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