Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6d8bacd3305e31…

MALICIOUS

PDF

90.9 KB Created: 2021-08-14 10:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 963ddee844c5f5d042fd0106de263f5e SHA-1: 33fd5784e9a2c8d483e8d9f97a9ea118a16ba996 SHA-256: 9d6d8bacd3305e3168429cc162e17a283611af8991e04ee5c7a7bd73e4b54c21
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://fogathajtohirek.hu/fckfiles/file/kopev.pdf
    • http://eksan-ltd.com/userfiles/file/8222964690.pdf
    • http://clearspace-design.com/CKEdit/upload/files/todirujemupunobonubat.pdf
    • http://www.ufolep-69.com/contenus/files/ximipegedajokozo.pdf
    • http://highendschmiede.de/highendfiles/file/buzumaf.pdf
    • http://megat.pl/uploaded/fck_files/file/22680606309.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ce4d53756---47185740215.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d942b033c7---61297690757.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3cef2fc2---63320539356.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ud99aevco3joucqj4jamvekb8r/pobiwurufiwadirijidulidog.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803613c8615---71360438574.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/4020932576.pdf
    • http://robalton.es/Albums/images/file///talapewidunupudurizotipez.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bc16b44c1eac425ea7344ae452411829/52503716208.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/q7e7305j2s9f4h9r112l10mdgj/gujelo.pdf
    • http://armanetti.com/images/wojitipuduka.pdf
    • https://brod-plovdiv.com/images/bazakizowapigakil.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2a6046d3cd5740e3eb6015b04c204239/48711205914.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/6fddabb1432f5eaa28394ca63b915510/rosodin.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c7daeb74---kajonezelesopumalegavori.pdf
    • https://alatheir.com/atheirwsfiles/file/93566416987.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+spawn+ender+dragon+with+command+block+xbox+one
    • https://mediaget.com/userfiles/files/sakegalopatutarax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e2.bin
49f0f13e906afd8ec8652ab0525f24ce80c8b82c28d5f7b929d8fb792c6f8d12
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 11372 bytes
font_01_sfnt_off00011110.bin
430f066d0d8ca660471a279760d80acfc9994401ad15850802f70d0b06ad1517
pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 19756 bytes
font_02_sfnt_off00014319.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14319 16792 bytes