Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1ac7d7b5d4f292…

MALICIOUS

PDF

87.0 KB Created: 2021-07-06 14:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79667eae9e2bf686007fa80f097d4dd7 SHA-1: c8762384675bf00a3066cf12dc5733c38e4dfae7 SHA-256: 5f1ac7d7b5d4f2928590914a8dc47f2f06067b18de5adea40b43d6a22974375b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the link farm structure suggests the document is designed to redirect users to potentially malicious sites. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=above+the+line+book+summary
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33205bc76---nesadedexikesipapirefap.pdf
    • http://kayapaliinsaat.net/file/xekusikilitinalebet.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba14366b3---kawewezifore.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d37fd4fa64dbdd3ed07d01eba6327eba/wufekebutigepuvuwuzozeruj.pdf
    • http://aklond.com/UploadFilesfile///2021043009263128.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/c0ciu6491c6l11hqdnv3mtlar1/23377651300.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c99dc60455e---noxevimag.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a618f0fa1---giruxabopo.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3fbc8095fadf82bd5600e5f3e3aa565d/niwefunamibatiso.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2f9d3dka6asqga7f83r3rok4t2/degelelidumekexi.pdf
    • http://pwr-tech.ru/userfiles/file/44725927180.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e0e7cfef47c3511fc13460883d85c19d/7230184470.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ce2ba44a---15428905610.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087322f8283f---jovik.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/64334968866.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075b08eab2d6---dilowexojanogijumisijenud.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/92b1cf192788928764dd09f308d7a385/bifutamovumupo.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ea7f61b72---28827759914.pdf
    • http://minhvuongthuphap.com/upload/ck/files/danagaxalegekabux.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160877f3911eee---muvulapidamapedujoposebok.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160af9beef33c0---35300793578.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/56e6ab1d24698219a895abba43fdf30e/ligabeluborofaparisu.pdf
    • http://rapabzenec.cz/obrazky/files/fuganakupaluxiloj.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_off0000f184.bin
7dff58dad7b4a066814ddc85216352b8f2c70c4cc9fef0ef713709a5a1addeb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 10864 bytes
font_01_sfnt_off00010a7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 16792 bytes
font_02_sfnt_off00012290.bin
610c0aed4b334ef0cfd05479ab6c28ac21ed201e0f21d4694ec17b1cb927f46a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 17128 bytes