Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc26c7a34d9ac84…

MALICIOUS

PDF

88.7 KB Created: 2021-07-21 15:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78b4a8bbe187c78b880742086e73f882 SHA-1: 527b4c96d2b70ee2261616d6f1e9a38751400da8 SHA-256: ecc26c7a34d9ac8458082f8a025a2ad4f30bcead08d4af21570d172f3b6159fc
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e5463003c---pomefukeruletajabojadin.pdf
    • http://ecohouse-lab.com/userfiles/file/puxunizugusu.pdf
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/lunage.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/gorijafakiretimid.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9345c1ec---fawunidig.pdf
    • http://automsystem.com/UploadFile/file/20210514151550571.pdf
    • http://schokobrunnen.com/idata/81709954806.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c8f204e0b52f5c939544834912597d6/petewagumapanedejovokuji.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb47c750cd---nadenajaluvanagedeku.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/v69hifmtt4bvu59tont8n829cu/59176725727.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/64139109721.pdf
    • http://fsnmmaterials.com/UPFILE/userfiles/files/86662256130.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2db48e6b19c71274ca0a5a87752ed9c0/dogaxeviwan.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/550397qffpjbkp3jlsthev9ml3/1853204204.pdf
    • http://wolfroccatiassociati.it/userfiles/files/pufaro.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2d0314e68199c2d284fcdc1d4232b6c4/63851392482.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/xawifapunewugogu.pdf
    • https://sunarchegypt.com/userfiles/file/68211807632.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9mn2ca515ib2pt59eb4eufee43/85082666438.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5afaafce445fae1f6dfad5bc2f363ff8/nubegudev.pdf
    • http://mulroyenvironmental.ie/userfiles/file/jorogidazovitodonu.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/87b395618d5697f10be6cf685f6e2077/romaxuvuzudidepagetam.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9dbcb443450636c7c112bc56c2a81f9a/verideruwageti.pdf
    • http://biotop-zamosc.pl/userfiles/file/vavafipupifezepetosiso.pdf
    • https://migger.dk/userimages/file/fesotitit.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7655e58342---mogewugola.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=forest+pack+pro+torrent
    • 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_off0000f2f6.bin
af5a6cdb479e2c9bb2583f07b27bb987fa2eed60eeff7c06391b505135e2abdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 18440 bytes
font_01_sfnt_off00012378.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 16792 bytes
font_02_sfnt_off00013b8f.bin
7a8dd4192ad845ebc3f198f5fd54b0d75b442274234544b320bb048922d8781e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8F 10296 bytes