Malicious PDF — malware analysis report

Static analysis result for SHA-256 52add330b5286566…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 21:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abd6f80ac8ae14d332daa7ecde396075 SHA-1: fe467d9fdc980db1bd05674173a0113347dfe042 SHA-256: 52add330b52865666655972999509d5a1b86f2cd6c2277b737d2eeff50372613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=conversion+de+pdf+a+word+nitro
    • https://saglamahsapkutu.com/img/editor/image/file/37440928469.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/bivuzoxama.pdf
    • http://pappteam.hu/userfiles/file/vogavutofuz.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4923073cf---vasabotoma.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3lot3hri35bfn2sqrd1keou543/82587155119.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160759708b09be---losuwum.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082afe48930d---mapozemesimisulek.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/80228521131.pdf
    • http://epmresearch.org/userfiles/files/34867358153.pdf
    • https://tskrea.com/userfiles/file/juvifutukofofaxigarikaba.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d09df606b3f4e4881ec197859b65e7ba/kudikadojamexuw.pdf
    • http://photonart.nl/phpcmsys/file/zivonazufulixidiwuzad.pdf
    • http://annamsaigonlaw.com/upload/files/wikigiwetevenoxasefu.pdf
    • http://aliceinformaticasrl.com/user/pages/924985397.pdf
    • https://pristineleather.com/userfiles/file/zumamenefebebevapas.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fk370la3jfn34t103knaqrafec/79627828651.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ebebb36d7---13021395356.pdf
    • http://stlnsk.ru/uploads/file/suwujez.pdf
    • https://kompaspt2.com/contents//files/ruzoti.pdf
    • https://deltagroup.bg/uploads/file/gimonovelujemoforaninite.pdf
    • https://samavetpharm.com/userfiles/files/nosunabejora.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd57676d8c---pafozumekeduveludofevu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074728b8911d---fodoma.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_off0000d3c3.bin
2e3dd631d6b2b1d3f86016251adc37030a28f2b8eb08fa8585831a4c920bcc0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 20084 bytes
font_01_sfnt_off0001074c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 16792 bytes
font_02_sfnt_off00011f63.bin
9eb41d4f3357b36b0c757ddf67bdd062678de98f263e483f214b79da3048e5d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 10628 bytes