Malicious PDF — malware analysis report

Static analysis result for SHA-256 96429c177a7bce09…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 21:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fbddde108ed035f0e1e3ed257aa653d SHA-1: 49dc93b5d405dff76b33e1836a969329072f4888 SHA-256: 96429c177a7bce09795f7189befdb868ceb567a10f583034c60bf30b3f00b52a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware distribution. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://diversecityuk.com/userfiles/file/kozagibexelofogifizoja.pdf
    • http://szwygs.com/upload/duwedenevupopozime.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846ec07fbd7---riwafowezugob.pdf
    • http://pathtojanna.com/userfiles/files/wujulugof.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5v70ale97ri24nbsfdp0npp945/92894711957.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e0e265efe6ece3812a16c26e733ed6ae/62233534157.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f770fef4---logukokigenupererigirewo.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ks1q8qs3obosbctb165v10um3o/pebidokuseko.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/rugazuvivekotogifo.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9b2tc7e9bdcs3kmugvm04spvqs/59693969494.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/55cd90e7c441eee4e793b17e09ab7261/wezozix.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a90310c5---73804517427.pdf
    • https://africanresearchcenter.com/userfiles/file/xubujitewurazomazufisonu.pdf
    • http://jiangsutravel.kr/userfiles/files/20210608_020842.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/7359bfcd9f4d4df3a63c189677e9a816/geberufinadikikutiwovi.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/9413747017.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/47e2df3387c28cc88339a0a751f394f9/tixaxefu.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210614163446.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/aopmhpvfo3h0tcvt7hjik1ie16/mujizekobulaw.pdf
    • http://dejede.com/userfiles/file/kilegoxasawi.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16084bd25edd24---litozukok.pdf
    • https://uleiuri.ro/userfiles/file/77578296247.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=merchant+navy+interview+questions+and+answers+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_off00010bcb.bin
36e46ef54ef7359d6cfca93b91ebc3f219dd6a6d2314ca7c3de6eff10a40cb40
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 17820 bytes
font_01_sfnt_off00013a93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A93 16792 bytes
font_02_sfnt_off000152aa.bin
f2f76d9214a705812b559f1fa031b93dae2bfe1b46fb96b7d0f45fc67a1ec029
pdf-font-stream PDF embedded font (sfnt) at offset 0x152AA 11176 bytes