Malicious PDF — malware analysis report

Static analysis result for SHA-256 754fa3de6497d388…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 06:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 04a4a2128aff8c13d9cb681e5c265c7b SHA-1: 39dbdcb5ba780f2fa867d939a05d0fb0e3a79445 SHA-256: 754fa3de6497d388858fc3319ae4f0f2432739dd0ddec05c07a27a18999257d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=kayakalpa+payirchi+tamil+pdf PDF link annotation
    • http://beiwendq.com/userfiles/file/31031396200.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/73500671492.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/numosevinagedemalan.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/42ac25620318dbf2fcc34e4328c8e00e/zuwuzujivisosu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b84e47ebc49---gagekem.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7745d7cf7---440651530.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/rosubitoxosetinerodopen.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089afbc796fd---fesuzowuz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3375d3991---totinijolosufulekimobi.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/89388418467.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/60767532497.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/jigadamonomuligasotu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160881ca4f1894---xoluzitabubuxusemopu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbca75668a1---dimakiwutomes.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a42ef109aee303f5e4ce89a214deb1a0/mogewobepemulewutedufev.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/33624e1ec76c7b2cf880bfe6826532f7/pivosemowusedafasezelijo.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/52428768910.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef0d87d203---vizitisinafujev.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/47532628046.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123925bea622---32876229567.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/u8m8knop2somsgpa9ab8ka5d00/gijani.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42373919d---lalosimevugekisexigutex.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/65251379218.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a247b1fc---lawinadi.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_off0000bc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 15220 bytes
SHA-256: e133a29a75d6f226d816fba70d305d204413b3d7dffe89dfdaf09b2ec64d43b0
font_01_sfnt_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 10560 bytes
SHA-256: 5072817807c5e175e5c95670c32f93fcc767df0c8c73bb76ea1d5ece472e61ff
font_02_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1