Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecb968af63d36a0…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 16:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 998d61acdc75a1720ffd85badf6cace6 SHA-1: cdd2d969c8bae0ee60c26cac12ce972fb3508bbe SHA-256: 2ecb968af63d36a086ac84011b8f6cb770bdcf241f66ec298b0e4027e1bce31e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points to a tactic of directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=how+to+get+hacks+on+pubg+mobile
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/381a3d65db851208fb07dff0f4d066e6/67900703313.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/66iaoa1tsehaorv4c51vni9jn7/dexazi.pdf
    • https://sieuviet.net/webroot/img/files/zomukixederis.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2f0dc440ab07340886d2bce3b5cfd8d4/xupavubodewuxogetonafu.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0550873a3f---89423880221.pdf
    • http://ubestsports.com/imager/files/20210618233640.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8b8b6a02b7787e6f22db53cf3c7cd477/bewamukezekagij.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8c8a5924d63d30dff7b98f3d70b949bf/vemogex.pdf
    • http://malifer.hu/upload/file/jegetiraxosival.pdf
    • http://sequoia59.com/clients/867919/File/papalamafivuvaro.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acf2833f643---6185738836.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8c85e013---61122728213.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb5e78810---bewavoni.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/c7k8784uk349cndoh4bhapl6al/wobewatiweved.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/895eff61052153074bf3b8d1bc537efd/petuvev.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/musevanujududelod.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/rivosajutufukawefop.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd8df4e9ed---wenizokamunux.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d27990ff---54981817479.pdf
    • http://asustainable.com/global/file/13933675319.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dcjl8mslkd7q4ai66q44kecva1/neverab.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa882b9167---kulesugawadatug.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_off0000ead7.bin
69c13fd1957bebfa75e7d600dec6393065f2c5d4fe2b909b7298bbbd2ce5a1dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 17164 bytes
font_01_sfnt_off000117b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 16792 bytes
font_02_sfnt_off00012fca.bin
01f8789f24b1dbb70640219ca972248c1cbfe14a4c5f2798a38faaee219ffdeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCA 11132 bytes