Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f05120237caa4f9…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 00:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5d3ded11b898ccaed183e6a7e448555 SHA-1: 48feb149b1ce923fda804df93c6cb74f09a3b807 SHA-256: 0f05120237caa4f92c8d2a91e4db447b428f101f882645e0e21080bddff23c62
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/95352bbd4b2722b3ca405a693de878dc/weziwetavogekolinunozin.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/8e4ec389c8ac47fa2817ee7b554e285a/46377088739.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/781b3bdb578458f02e027ef6ec0e659d/lumibadisorupirewinoje.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf59c5399---79225117484.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/83322485201.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160860eaa5d913---96283803241.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/t42lph8i4ps43u18amati0sram/35778713994.pdf
    • https://suma.ca/upload/editor/file/29999868916.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/ea59e4b0b0cbf863c64920a16f6c9488/70997324716.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/jvj0b5f2lu0pu07mqns3dmqhb7/88154692413.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/69784092331652f5a827bec89bf60837/makoletanojomuvefez.pdf
    • http://panziofabian.hu/fck_kepek/lunuzudun.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/i8c9822s1q0d47fa5tnjgpfgs5/wasejojarimamokorixulu.pdf
    • http://hyundai-dongdo.vn/images/files/29791190890.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/899c633a9e5e693cb1682dcfabf7aefa/98431709536.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02fe9058d---43343399959.pdf
    • https://muguet.fr/sites/default/files/file/mazixegaw.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f87b8d0218---jozuman.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12d5aaa4c---doxamomones.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d1755d71e---62829317528.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c381b373665---69897406222.pdf
    • http://sity-luxe.ru/userfiles/file/35296170124.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608925b56528a---duwomibuzowux.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+answer+how+did+you+hear+about+this+job
    • 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_off0000ec9f.bin
6d34fcd7c4535277f756ba20dcb483f9cf62e03723dc6dd0278c638fc7a916a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 17740 bytes
font_01_sfnt_off000119f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 16792 bytes
font_02_sfnt_off0001320a.bin
069df5553b27223e12bb3ee55cc957cc910a43f426da8cd42dbe702b0d17b310
pdf-font-stream PDF embedded font (sfnt) at offset 0x1320A 10860 bytes