Malicious PDF — malware analysis report

Static analysis result for SHA-256 57425ceebec92d87…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 10:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6534b5b12f49f83701bfcfd5ae6c78ee SHA-1: 4d5e0f0b828bd51c4bc16768fa7e6ff4f5ac4982 SHA-256: 57425ceebec92d878502016f705b936d236acca39ce91e0ff2225c1d52722b8b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the presence of external links and the high heuristic scores point to a phishing or drive-by download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097edccbebab---kafanegupu.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2de4aafea---290291335.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vaf9g1o5bpb1502cak4o3tnmg0/48962858466.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3414f5f285---6787240295.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606c851506736---36386801437.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/kizegakedokesemotig.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/42cb9b503ca6ec6dae78c6af791ca526/32145470643.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769236381f7---ratemawebizud.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6039c1221a---sesebeduw.pdf
    • https://rh4-h1tapi-turbo.com/contents//files/80606137726.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6148acd8---wabeno.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e975fe07cc3---59969485042.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a811c11ed6---69349143419.pdf
    • https://martensmgt.com/business_school/uploads/file/6080825203.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/46327083199.pdf
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/wuxonivexipeme.pdf
    • http://gd-weimi.com/upfolder/e/files/20210705102523.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/fejrpr539qsj52huf7v50i5uk1/nivodijujatukagokudi.pdf
    • http://zulassung4you.de/bilder/file/geruvigifexewi.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zaguvani.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vj6bvqicusbq3abbpulg1ucsv7/48064102192.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/320c2d09a4ccbf1296d4697260b0f3f2/xaken.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+new+messianic+version+of+the+bible+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_off0000ef20.bin
588772e0ae90ea3812c5b9192d99f89fe1c868e2f299b75fae998801a0a52209
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 11140 bytes
font_01_sfnt_off000108c3.bin
44b877c741dc1f1aa8983de546222d4496b6d4042c621d266230d5c48cce1537
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 17316 bytes
font_02_sfnt_off00013654.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 16792 bytes