Malicious PDF — malware analysis report

Static analysis result for SHA-256 076b55c416cf7dc5…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 12:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 406477d8bcedbeec88f781de298a823f SHA-1: 5d47862a627c469b43a851c79a1becc00f7296ec SHA-256: 076b55c416cf7dc50236de21372f6e7c1cea396f8ad1e3c692560df8efb20de8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The PDF contains numerous external URIs, many of which are hosted on disposable domains and point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9453b1dd04---pafutekowaxapope.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c87ec6b6ef0dbe96187cefb25b724b2a/fabumarikoledego.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/12517342833.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/94976542946.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077d610e600e---vepavodekoxajudixanozuj.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bfa77346---rigojobisizeb.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4bm1r31352msso731604jj5f47/jujago.pdf
    • http://market-oborudovanie.ru/upload/file/meworipasidipamuso.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d94b2e8d3---11823245278.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/24ced1e543cb3362c8e11beb627614b4/42224625838.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7780fa598b---8497804536.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2b647f9791813edcba586114c55819e0/xivixilufifivogulemuvazov.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a77dcc8508d---86706907840.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11f09e05b---zotibe.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1ldvng0vchomfgoos1ktkeo0s5/68288303725.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7bdefc3588195a4c491d86f4af7788e6/buxuxaxujepisat.pdf
    • http://sincaremedicaltour.com/js/upload/62740720399.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/jikozakojunekumirurevami.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdb2ed685---95124925769.pdf
    • http://446888.top/userfiles/file/91112691812.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/61b6eb2316cb4111905ab65b2364ff8b/42192562144.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=100+employee+owned+companies
    • 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_off0000f577.bin
4a9375d4098169f6fdc4078bd8bdddc0500271b6be36e9ec7e7cab05ec62fccd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 10752 bytes
font_01_sfnt_off00010e32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 16792 bytes
font_02_sfnt_off00012644.bin
7fe94270aea4b21e517c26a579b5d7a2aafaac6d3633f2e483cad083becfc0fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 17784 bytes