Malicious PDF — malware analysis report

Static analysis result for SHA-256 429054ee4921bbd1…

MALICIOUS

PDF

75.4 KB Created: 2021-07-03 12:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb14698120978edd6f7f4950a6b36f14 SHA-1: 9325c33b262ef724a398deb15cf4a4bdeee723e4 SHA-256: 429054ee4921bbd1a00f12ce1e139ff8bde846a1b1139158419326e4dcf478c9
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=how+to+draw+jack+and+sally
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/p6c1hn709f0klnlmk4cqk6g7rl/jitobotizatijeweliwob.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5fa502d1f99135e1dc66c363fee75c24/muvaxoneb.pdf
    • http://sotel-perm.ru/site/file/rimuzase.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918fc9152b---6843695208.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ch69j7atl9g43nd2otf23h0qm1/navubalijepudaxepuk.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/37fbc24247b0c626c3de384864ce5632/43535428793.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14dbb74ed7---35275588857.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7e36ea0e2953106dac6476f45c7df177/tugani.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4dd6de1dd---pavibekekegapoze.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vkvovm7heqlkb2u1ubvre9gped/denuwemugerejixabokazit.pdf
    • http://tai-yang.tw/taiyang/upload/file/zobupomowunaruva.pdf
    • http://brenno-tojestto.pl/userfiles/file/wumerururebodujelaxuzizan.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2hkm0qr6ftalsn3i27tpt8cnv7/fuzog.pdf
    • http://richardchong.com/userfiles/files/70648007929.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a016e8c523e---podisi.pdf
    • http://zartmobilia.com/userfiles/file/20210522194804.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608552829c731---90381811741.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb12992eb9---tofotituzejavog.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ek1a3rs90u7nc31m4chpns61a3/49433914706.pdf
    • http://marcelponjee.nl/ponjeefiles/file/18070039070.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb57bba2c---kafabelazexupetus.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dc8fce8d84758a2d76fb53850ac921bd/sapefebu.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da77fd889f3---gagejadixu.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_off0000c5e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 16792 bytes
font_01_sfnt_off0000ddfa.bin
56a698821e09c9d67caadb714b985155a60699e89cc8e7e05944b9057567812e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 16360 bytes
font_02_sfnt_off00010826.bin
d7fdb8415271a126737e9bc798e7438265f63816c281fa6a38e8ecc59a631a0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 10552 bytes