Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea2a59b41eb137f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-22 13:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08a7dba1ab84cfa4475a0c512b8d1e40 SHA-1: 1cdb6abbca07e0b7ede95db681d7f1a5d5938244 SHA-256: 6ea2a59b41eb137fbc19d18245d301c2f2e1329133fd488811f36a9f078a0455
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to host further malicious content or phishing pages. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/91427299817.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cfe3b119758f179c6d6c6a413af6f7ba/kexegixebile.pdf
    • https://xuantruongtech.com/images/ckeditor/files/21391478006.pdf
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/77012197268.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/kilenazuxifelawakilemuzim.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0ri2o4bem0s2k6ueai893aptt5/15716001792.pdf
    • https://panoramabyty.cz/content/64665385974.pdf
    • http://ch-yang.com/upload/files/79828069521.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17544b26c---70393644863.pdf
    • http://highlevel.pl/userfiles/file/bifujonawemuzof.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4a77c4d7295e2711aa6b15e8b6826e2e/nesowevavaxetu.pdf
    • http://www.ctnphrae.com/ckfinder/userfiles/files/natupo.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/45705366426.pdf
    • https://bandotrading.com/uploads/file/joretimitolume.pdf
    • http://alltechsro.cz/files/56887183976.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/pubeponanebedirotamow.pdf
    • http://noclegsosnowiec.pl/eurostyl/photos/file/35279808263.pdf
    • https://kingdom.vn/userfiles/file/rinarusimoda.pdf
    • https://vinacoma3.vn/userfiles/file/vetaranovifa.pdf
    • https://srldirect.com/ckfinder/userfiles/files/voniwuran.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/75373965956.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/wirusitogefo.pdf
    • http://raffaelecavazzoni.com/userfiles/files/zinorukinumuv.pdf
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/xuzatinamodiremapumaruwe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fifty+shades+of+gray+stream
    • 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_off0000caa3.bin
9ec5c4d3807ba512d46685d3a0c89481044cf0a1a651818faf2c1d4e8eafb1f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 17980 bytes
font_01_sfnt_off0000f942.bin
164de60cba0151878c707e7297e36f6e4bd890313c55550a64117bdb28f56d57
pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 10744 bytes
font_02_sfnt_off000111c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 16792 bytes