Malicious PDF — malware analysis report

Static analysis result for SHA-256 5094303a9d18b03a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 05:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f49555d6138d1f057ede353bc3c98d5 SHA-1: 18ff9002eeb43bb2ed19e08e19b6bfd9a763d01e SHA-256: 5094303a9d18b03a99774421251f87f4c5a0aea2048ac40d1731c924dd0b7817
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aite-materials.com/upfiles/file/14061860311.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/is7l80c45jsg1suit8gauon8p2/govaxujukosetivatoxev.pdf
    • https://abofahed.com/userfiles/file/binax.pdf
    • http://yasairamenbar.com/uploads/files/xiwiwavupojuwufibam.pdf
    • http://liveisagenix.com/ckfinder/userfiles/files/gamopuzurujuwisiwedoz.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e843f6448c7520609da13d83e2faf4a9/xabuvitebasaligega.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/34311215238.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5ed18c35ac5snnsc25to1df6us/29194734524.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610faa8804150---kosoxilovowa.pdf
    • http://www.pics4us.de/userfiles/file/84385514335.pdf
    • http://songhandiban.com/uploadfile/file/2021073000575373499.pdf
    • https://speculatio.in/ci/userfiles/files/fekumur.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079278c320f9---59676257674.pdf
    • https://ksuskalology.com/images/file/kejusetegetiwiwipok.pdf
    • http://tikatalog.sk/_files/file/jagelajago.pdf
    • https://bnbtravels.com/ckfinder/userfiles/files/kijomujasipi.pdf
    • https://mclandpin.com/calisma2/files/uploads/simumagazoluxa.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l5tkovr0nas2ohf366788tmsoa/widupe.pdf
    • http://xn--lv0az70cxar.tw/uploads/files/202108220923323054.pdf
    • http://tylincms.com/userfiles/files/54125390919.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/sowezesudijo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76358bd9fb---fovosax.pdf
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/dafoxodaf.pdf
    • http://jarosi.hu/files/file/28227385421.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=upsssc+mandi+parishad+syllabus+pdf+download
    • 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_off0000b9c0.bin
14ab871057460767a6498315d490c0a0d2c18331d42ea50ff7706e47d0130dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C0 17320 bytes
font_01_sfnt_off0000e6e3.bin
40a7ac71573efa1c588f25df28911aaaf6fbbe5261a68c694386feda1ccf04a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 11104 bytes
font_02_sfnt_off0001005c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 16792 bytes