Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a20a80247ac4c4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 20:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06d6d106947dea667388a1bc53f42e0f SHA-1: 4b78e56d5fe96b253e01b9746350bcd4107231c0 SHA-256: b9a20a80247ac4c4b7536e7ddcdf7bc64e605d38752126a9276983afbbbae33b
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 CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 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://archism.ru/uplcv?utm_term=animation+throwdown+unlimited+gems PDF link annotation
    • http://lab4050.com/upload/editor/file/35917428297.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210908130757.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab860ee6f6---zikezivotaxanujukux.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c834456d---wufotukobemajofuvit.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/57943326669.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/72634323741.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/surixorobujeziwedabukinod.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418627ba09f---78947241527.pdfIn PDF document text
    • http://el-tall.pl/pics/file/44948262307.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/tavulizexejidevowu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b51bc770039a41beacfc3bd924f869bd/vozefabu.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/kujilugukamejoderiko.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161416a4eea39d---59063173574.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/gukenupufiraganofixewil.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/41203852553.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/12833207957.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/fetuwuviregumeduruxa.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/16358175421.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/7809751063.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/2548703476.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/rinalegibezeviziwetibafik.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/tasetamenitanokuduvija.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/fozedefuxenovovi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 15832 bytes
SHA-256: 7a67e3f8a26eddb6989b695c6c50c46851a3d7702fab14a4a121e60175319fee
font_01_sfnt_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 10864 bytes
SHA-256: 55994b569f5c1c97ee551d4a155e6c2af9ccd7acc79078c267f899fa38cb196e

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