Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a46ad634e62dc8e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 20:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 028308e23cdfd495ab3ffedcb4b80222 SHA-1: e4c9390421ebeb0b6041c7607e86cfeae5478266 SHA-256: 8a46ad634e62dc8e94f24032286e094b58abe73fb5e3983f35382abb971ef933
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=new+gba+pokemon+games+2021
    • https://beeshark.ro/app/webroot/files/userfiles/files/golixugez.pdf
    • https://robertbah.si/files/file/gajekebanonapon.pdf
    • http://koreanhotpot.com/uploads/files/munirosukupiziwig.pdf
    • http://yourmoneyyourbank.com/uploads/File/zisuxinoniwatesulufibatik.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/45508870548.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1cf32c40ec6156e75b0de2e6f487cf8f/95443418080.pdf
    • http://fanta-life.com/userfiles/file/77929734002.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613e553fc253e---sigabezafidasowenominaziv.pdf
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/fewekisigegogefuruj.pdf
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/21424759010.pdf
    • http://fsgpj.com/upfolder/e/files/20210908030841.pdf
    • http://thegioichuyendong.info/app/webroot/upload/files/tanoxofabikimezik.pdf
    • http://salon-urody-bellis.pl/images/file/gekixefef.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210924_42AEF5CF9C986824.pdf
    • https://almavilag.hu/files/files/busidomatupilo.pdf
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/kuwovebarewaburok.pdf
    • http://nujhimachal.in/img/uploads/files/rinegopopinuzonazazofu.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/veralaxo.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/xenoko.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16146fb074de2a---vepegubisakivove.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/ralodifenanudetozovofo.pdf
    • https://edgecs.com/documents/vinanixarebogajila.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/fumupopokosigezukizizeguz.pdf
    • https://hlj-vibration.com/uploads/image/20210912/files/20210912181228.pdf
    • http://jakpaisanestate.com/images/upload/files/wavodobuguvepatuba.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_off0000b3bf.bin
be6c7f19fce0cb29c90c6a1c515be6f02cca149fdeca9727cd031a04e214f55f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 15112 bytes
font_01_sfnt_off0000d97c.bin
b6b275b04b74a607991cdbe70a3444987c6e83888fb32312a4a93455df64aec8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 10848 bytes
font_02_sfnt_off0000f276.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 16792 bytes