Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fd892267db2daa…

MALICIOUS

PDF

98.1 KB Created: 2021-07-07 19:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adbce1ac05285657b8695d5145c72471 SHA-1: 5ae57ddfc9a2a5f46a35784a68d9dec93cfab29c SHA-256: 45fd892267db2daa2a986d4c830eedf979b8250d97ae25471a30c3e1dbadfd9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests an attempt to lure users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cgpreceptor.com/ckfinder/userfiles/files/88349462958.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/8283db98c041932dd05ee75b853ad3ba/25492887841.pdf
    • https://net-mex.hu/ckfinder/userfiles/files/83838789406.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf1f98689---80464104802.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/76pm4gcoko2i8j3cc3shmqu2o7/nimifaxuvojuve.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mdn5temdjbe942du04ubvq499k/45900926426.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609417af1c865---xarezaronowej.pdf
    • http://al-bandak.com/userfiles/file/9816833743.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/mpntmb57ke5oo7gtdjkdqrfd53/jurutedimorogalatepuvo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba62eeecd0---97403931162.pdf
    • http://cheers-gifts.com/userfiles/muvutawupenudo.pdf
    • http://n2nnetworks.com/files/others/24912283420.pdf
    • https://balajitutorial.com/admin/userfiles/file/15954465620.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e1d0653e---pewixalunovifitotile.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7756a2c3c---sepasadebixateno.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e7e1948e492fcb2612355cc1388a2267/nazepesuzed.pdf
    • http://alpha-th.com/userfiles/file/52974224962.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a699bbd5320---nipanimefewexepo.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660ab8f3c3---vunelitivalamef.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb279d0ad---maguribib.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1mi1ma08blgi92n9t2ghrfm0rl/kefunofideboromuwekifuw.pdf
    • http://aire-limpio.com/img/editor/file/20464861836.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=intext+question+solution+of+chemistry+class+12+chapter+2
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001012a.bin
e2ab40285be66b030a26fa309cb6237c5002bd55618e28d5f6d5a2712c8440de
pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 11328 bytes
font_01_sfnt_off00011bc5.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 16088 bytes
font_02_sfnt_off000130fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130FA 16792 bytes
font_03_sfnt_off0001490c.bin
e9fdb97e8c1aeb90f036947b4a89743c53b98efe2f1dde89a619ba90bbab2504
pdf-font-stream PDF embedded font (sfnt) at offset 0x1490C 17768 bytes