Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cc78e9d930bb19…

MALICIOUS

PDF

74.2 KB Created: 2021-08-05 17:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35af68d5607bec587d2afe24f65ad41e SHA-1: 072cbfc35fec3f154b3103d7344524ab6254ec43 SHA-256: b6cc78e9d930bb1967470bc92bb817597a5acd2310436d5e5b46cb6e644ae488
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites used for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites through a link farm. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond being a vector for external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://poker-fire.de/file/95876221958.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38b122e8e0---jidevu.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/kogojeto.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/62b2fb3d5545f5ce0195614302069919/tekajorovujekawu.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3435747c3---79750077030.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/85915162523.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/00sk7fe35dna5ok9sa3d413lf7/razutufalexesonukelu.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210614092720_ubgvht.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5c4ec4c1---19588756576.pdfIn PDF document text
    • http://flexa.cz/docs/file/gavedalu.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/rufawexekatukutave.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/88239520761.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/6374117233.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f2ab44052---5464407218.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/145e4dc293660f4cbacc5a9fdd3f5b55/65496411071.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/rilumal.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/tipefopikolipiforakizelo.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/5d237d42af28545b2496db836f8c6778/1381026443.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/lirududunuboratadomivamir.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099184193c58---43651476093.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/pediwusiz.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/2995147417.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/rezozune.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e5e9244f---74986096888.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc16eb9a61---86061704828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=actividades+de+las+silabas+pa+pe+pi+po+puPDF 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_off0000bd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD50 10592 bytes
SHA-256: f821c2be84793ee7c80ff601b7c19c264f661ef09632716f7cab062ae69787e1
font_01_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 17388 bytes
SHA-256: 66f048d25e3e76577f43182226e4ee40c33ec96f47682afe52a40aeca157d5f1