Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c311003c8b78e5…

MALICIOUS

PDF

79.0 KB Created: 2021-08-18 14:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85d92005c0b0c04c62b5c146e49c1335 SHA-1: 1d57ab854dabf910a75de39cce33b56c1c5ea721 SHA-256: f8c311003c8b78e5703a1b93e03fdc9ce42b878035ad688c25f97ddf12e49ce8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=watch+borat+online+free+dailymotion PDF link annotation
    • http://vlajamo.cz/images/file/19198136583.pdfIn PDF document text
    • http://goldmustang.com/files/files/fowozogipakediguvituku.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///48598790298.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5untti8n55de4jbea6g98dmv9n/1823596217.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/73432882782.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/lopadas.pdfIn PDF document text
    • https://emmaushuis.org/pages/13884744785.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/69202201835.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ba0c9cb74f43a70d21608ce08aadf305/23194299912.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/gajeditesabepo.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/rumokiluwefumatusa.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210723142031416.pdfIn PDF document text
    • https://lasanisports.com/files/74513147631.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d6983ffb---rikesonunateg.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/me5kvlv729otvdkeeof21lofrf/gelinifomavipixiwisax.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/daxesejevasenarom.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6fbc181126d9865b31b394c7a82d8d29/80045925734.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/721baf88fa6189f312a87e32b1d50c68/31100981044.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d659c08b9e3---zasutijewoxo.pdfIn PDF document text
    • http://mrybalko.ru/files/kokukokikavu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d359b9297c---19928327290.pdfIn PDF document text
    • http://praguetransfer.com/files/file/85696704183.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/90695658773.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607758ffeae89---23234962300.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_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 10820 bytes
SHA-256: 2aa0f6a38d0273d4463a9ef4612a44aca7dd56ff2f3f788cb997961b10784466
font_02_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 17508 bytes
SHA-256: ab291f775c4c37609150eb927f04a5a7ccb36a0d764e4c31b06c42785bcfb7c2

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