Malicious PDF — malware analysis report

Static analysis result for SHA-256 7936a70e45c789ba…

MALICIOUS

PDF

92.9 KB Created: 2021-07-21 03:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0862f85bd2e0e3c2399a3b55a1768691 SHA-1: 08310e194e423bd429afe43a22056f15908f0c19 SHA-256: 7936a70e45c789baaba8c49232b85efbc9a93538f60b64fdd92f19c6ecabc23a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of JavaScript and the link farm structure indicate a likely attempt to download and execute a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://texmet.pl/userimages/file/76448804637.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609aead3cfae9---45913548304.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084950f8c117---kelavuru.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8ef236778e51f811229f746a4c5efae4/46088990728.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081d86830f54---55689182634.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5215235711---mujoroxadakikidirut.pdfIn PDF document text
    • https://eventaipei.com/upload/files/81633234700.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/69e11679d614b4580242c4f2e4d0a84a/44880417997.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/nejolalesitifi.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/pebumina.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4bf387e0596530835b1c3d7175bd2db1/valiw.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/34c8c20f57b920590c11bce0dea857ea/55969558941.pdfIn PDF document text
    • http://wjcopy.com/upload/files/51887433180.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/lesakanotezabuwotejoxen.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/bmk6oiglmucm0lmn5sg69vluc5/15241320362.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/repaputasulipemiwojir.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9advvrumf8fr2f5pi5erk03fa3/64726658647.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/67978197699.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d0206cf7d263b7eb18b7103aea37bd7b/zilalemalaxaxejiv.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/xigenorolikatogasikerevez.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095b61eb76ba---66585953348.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0fd21269f5c4a624378edf97a97fe77f/62726118470.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/60707891601.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/nobepijopasajowebutom.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/xifedowabutuvirip.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/legasazolelabivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=song+god+wants+to+heal+youPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 10712 bytes
SHA-256: 3ed245d6efbef16643b542d8f6869834dd56723f9d931ae15b76b4a3331ae9f2
font_01_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 16528 bytes
SHA-256: ed86cb093bd34ecfed3a89f792e88cbf50db0bd2405630de5d0c1609460a2848
font_02_sfnt_off00014e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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