Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cc52101ac462b7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 15:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 112354be1b6a2add35797dbe308fcc4d SHA-1: af5a73badb20c859e641196993ead4a5767c66ae SHA-256: 32cc52101ac462b764531ac9925b62b8383cb766ef523833eabf3471dd640d71
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ablerexthailand.com/userfiles/files/gemifujukapubegubiji.pdf In PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/46200868043.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/82609347279.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/48797684793.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091023383922448.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/58778243066.pdfIn PDF document text
    • https://advik.net/userfiles/file/zojuxofumogovim.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/dakemukajixufasuk.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/8846196603.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cdaa2e911362282c2b9f75d471f76f45/demoxiregaku.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/36983145176.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/dibubetotowuf.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0531036dbb5f4229c93dfce072ec7688/gaxulujite.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/fenigo.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/27906719353.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/90497709255.pdfIn PDF document text
    • http://swhos.com/upload/files/xemupivosolefux.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/denubawonexuxo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321525a6f4f---67918270535.pdfIn PDF document text
    • http://synphabase.ch/upload/file/sodewixonogokamiza.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/vubonaradedofataz.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/befej.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210902101649880155.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/radoduzojedavutisasenare.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/tuwafubanekixudalawiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=yandamuri+novels+pdf+free+downloadPDF 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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 19648 bytes
SHA-256: 48c30efe5a7ad7b326869cd31f75c4a20d88c0b4b4272aeb22738feb56cf8a5f
font_01_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 10796 bytes
SHA-256: 47f222a2f8105af1222d489208609d322f18308c97f7183110ab7b8548f7782d
font_02_sfnt_off000127c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1