Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f41b71e23a293d7…

MALICIOUS

PDF

223.0 KB Created: 2021-09-17 01:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad46d54141026d668cb468921aeb6d4e SHA-1: f2f58a8860db02a96b5b9d360b05f6f829ed0096 SHA-256: 6f41b71e23a293d72a3a11c95c4beb938b6c3ce3b26fc1a439944a44e8a85ed8
126 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating it contains links to compromised CMS upload storage. The embedded URLs point to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL findings strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

Heuristics 5

  • 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.
  • 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://nedimgame.com/calisma2/files/uploads/rafogujefofalomiromefimed.pdf
    • http://yuhenganquan.com/userfiles/file/20210904182153_1269829649.pdf
    • http://tourister.kr/userfiles/file/tebajiker.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1f08dfe26414759f19330518ed2c3fa3/pewaxo.pdf
    • http://mrybalko.ru/files/52476634988.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa794d30d7---89637401854.pdf
    • https://funcarele.com/ckfinder/userfiles/files/28655226091.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/remaduwawaxutusuxavat.pdf
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/71923448075.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e1fe93ffe45dff1bebd9524302524a4d/rerumaso.pdf
    • https://hotelmitrutarija.com/uploaded/files/16764426918.pdf
    • http://sarigol.kr/userData/ebizro_board/file/wubozaforoval.pdf
    • http://boxshop.mn/userfiles/files/rejipesadanomasazevud.pdf
    • http://chinahongji.com/d/files/padajadeto.pdf
    • https://rsebolivia.org/userfiles/file/94936767561.pdf
    • http://poptheme.cn/uploadfile/files/20210911_221303.pdf
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/36398806675.pdf
    • http://praguetransfer.com/files/file/10188696192.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/salul.pdf
    • http://sushistoryus.com/uploads/files/44768099311.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/35138652501.pdf
    • https://ddnepal.com/assets/userfiles/files/kujebuwi.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/60566984201.pdf
    • https://groupunsur1.com/contents/files/60829022533.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/54608758747.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=come+liberare+ram+su+android
    • 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_off000307b0.bin
df09c8ff08a56b90be8218b77c4fd4b86e99926fb26231c2b8dfff0043f207ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x307B0 10580 bytes
font_01_sfnt_off00031fb9.bin
5b77388d8cdb702debbc2d5c60090910546a259d2c39df7f4ebb1a675970175e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31FB9 19748 bytes
font_02_sfnt_off000354f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x354F2 16792 bytes

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