Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e845471d283a16…

MALICIOUS

PDF

79.1 KB Created: 2021-07-05 03:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c733976550071d84c9b8243b1ea5642f SHA-1: 07f3037430c4051916524fa23b81bbd36b0f2ea0 SHA-256: c1e845471d283a16136d85bd278e0ed55cae9d84d1f3ad36da1fa9b0dee15528
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=jays+bookstore+dominica
    • http://kopdesign.nl/userfiles/file/33416210305.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ckhspb57hvntqungnqte69pv32/12878787542.pdf
    • http://mai-colle.jp/userfiles/file/24958997366.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a22cac4e094---jabefupolelogagirinigate.pdf
    • http://ztkammer.at/uploads/file/3042850024.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/tekefijogaxikopovolo.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3t67k3vud5g548shuumpsl5h8e/50989447755.pdf
    • https://marblobathware.com/app/webroot/img/files/55658962403.pdf
    • http://biomassasia.net/data_ed/userfiles/file/xizuvikinipiba.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a42b5b4e7384fd94ddd8aa8cb88f542b/fasosa.pdf
    • https://gyn-koe70.de/obrazky/file/63105492536.pdf
    • https://hotellemaritime.com/hotel/upload/files/todimosilirunizemezokisal.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701a2cdbf40---55765838215.pdf
    • http://pastoret.it/userfiles/files/moburorateg.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16203527249875.pdf
    • https://novahealthclinic.ca/userfiles/file/24065175772.pdf
    • https://parklanehotel.asia/userfiles/file/tesapiru.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/933998d774e3b70e00008af35ad15887/79284408872.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0db9a64a5---vogerikaretajozinilose.pdf
    • http://vtvxm.vn/userfiles/file/tazenonazerivorisux.pdf
    • http://magogaralbamoble.com/galeria/files/mevewenunutelilaxaz.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b99070567ca---77928777182.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a930df5d237a1a2666c2266d59586e2f/lisoxogapugufagifidovasu.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/kltmkoi9d31lgovam2riaq3l3k/bakewerivum.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/672475185b897a55b2159bb6d8f6bbae/mamaj.pdf
    • 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_off0000d277.bin
3d8e1d7e6f3e72d9d73e85774d7f12c5532cd9c4f0b93ffeaa18001561487c28
pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 10820 bytes
font_01_sfnt_off0000eb86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 16792 bytes
font_02_sfnt_off00010398.bin
7d5fe029b400ffabd204fe47331c796cae1d82b5118fcf0ebf8abc5546721ee6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 16840 bytes