Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbf683a1b598471…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 01:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 977303b5109e97c7aa26024a0fb321ed SHA-1: 61b8fb407ee8ef9eb655469f33fb18a2ba388fba SHA-256: ccbf683a1b5984715905a9df972336d65ad087291b43d931753d9eb014887c93
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or update. The numerous embedded URLs, many pointing to compromised CMS uploads, further support the malicious intent by hosting or linking to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c698902d50b---59998212554.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a0012e45bf7259800a929768261344e6/turavofikovamenuseramuki.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/g95rcb953778av8uujkel2uell/napakigoremobizexasoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098995798362---mifabi.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072016c81cf9---82823260594.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074152e08791---24390632212.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/a27613682367d6f9bf027087e910102b/1432019727.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c88007ac700---wizixepine.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/764108c86f0ca9a64199dc6abd9f3d06/dimafikolenefogikagaz.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jsenobtq5g2cibot9bg5v6d35q/26866214618.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b311eca97e0---32300787401.pdf
    • http://nw-line.ru/generic/uploaded/sevinomolevegitevujebad.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b6d42f5c522118f98efb5e36b3ae8b34/61567786963.pdf
    • http://esoftland.com/userfiles/file/mapexufanabekepokoximax.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6c00b68fee530f5fe08716fe8cda4459/vonajulubuwiteniku.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084a1a7a4e59---76348204079.pdf
    • http://holzbau-napetschnig.at/jotegifuxuzolovinofajija.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088618a818b7---71858672624.pdf
    • https://tavio.ru/files/file/bejozidimesopofazokis.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5f0ad338c96ab9e7a61d3aa38847587f/punanogabatexaliji.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d61fae693---siwedulufatubasikilugi.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/c31a23946bfb36caa5e4c456bc85a010/72843045921.pdf
    • https://blindnow.com/userfiles/file/15974374904.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c2fe39ae---13945466655.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=phet+reactants+products+and+leftovers+answer+key
    • 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_off0000ee4d.bin
82b6a9c5361a1442756623796dbff420c5de61e8c1c40f955aa0837cbd7fe8db
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 16904 bytes
font_01_sfnt_off00011a20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 16792 bytes
font_02_sfnt_off00013237.bin
35d1a86ccabe697c8a2013ed81ecedcab75b1846377287798b135c93c55ff625
pdf-font-stream PDF embedded font (sfnt) at offset 0x13237 11084 bytes