Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f6543feed1c7e1…

MALICIOUS

PDF

94.4 KB Created: 2021-07-18 00:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 735962c35fb47f0c5db1eac7cf84cbed SHA-1: 0dbac113e52c7f5227f3bf49c18d85ed11463d84 SHA-256: c8f6543feed1c7e1bc8fc6e2e5729d5e5b4a6cd068fbff18d9b69a56a4a8f2a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading additional malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aksusu.com/upload/files/35647671308.pdf
    • https://alianzatours.com/imagenes/file/fekogatev.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d905bb9b978---wuwupanidof.pdf
    • http://melhi68.com/clients/69549/File/822488863.pdf
    • http://alpha-cp.com/userfiles/file/65824761071.pdf
    • http://a-swiss.com/upload/userfiles/file/zakitifusezosifono.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/k1n4o2b16r9scob5kk3ahqq280/54063159965.pdf
    • http://casier-a-bouteilles.fr/file/81371505918.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30abd065fa118eb7ae79915e1a5076f9/gojowijusovubez.pdf
    • http://ansing.nl/userfiles/file/28618755284.pdf
    • http://dynamic1984.com/user_file/file/sorebosonugu.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad6b90193---titemasinarutawisunis.pdf
    • https://pui-vital.ro/msg_media/file/97069601593.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/51299586666.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0615f95d7404f962d30f9080e549e374/fupojow.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f49dccb58---31081843132.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vv8m3b3ri35gk7klicuin6m1rp/48832261097.pdf
    • http://china-engine.net/ckfinder/userfiles/files/90360029770.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/2e1inc7ers71t57sm66e2ke8ha/tirupotowitujelegin.pdf
    • http://www.majbrno.cz/uploads/files/56149948900.pdf
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/46028016116.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f21a2dba82---10328240921.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=thanesar+on+map
    • 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_off00010e0c.bin
667f6602ba204c43db76e819ac0b112138d15443fcfeb9f7d1701df87b14b541
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 10244 bytes
font_01_sfnt_off000124d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 16792 bytes
font_02_sfnt_off00013ce7.bin
2284977987aa2ec06213a366b768f80eeb665c8d08ebaccdb723ca0e1ee594ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 17844 bytes