Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1a12b403e68064…

MALICIOUS

PDF

70.6 KB Created: 2021-07-25 07:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2222d391a5326bc7ac5c542dd8daea47 SHA-1: 1c501d5046ca2e7779213391468bd50efd4375d2 SHA-256: dc1a12b403e68064a8469913cd030156b9748ccd75dca0e691d83d2cb799bfb5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://activepymes.com/pub/file/jezok.pdf In PDF document text
    • http://fouladsazanco.com/Upload/file/rixolebebisum.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/kanezenonida.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/nemebinopitomolave.pdfIn PDF document text
    • http://envigest.cz/upload/file/82941582115.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7110355563196b3a0b1325fb5b8f9265/domazilofumagosasetapage.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/tupaxiti.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/97215984208.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/81953715266.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/86815067648.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/57512755283.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a49b665a45---lajitibej.pdfIn PDF document text
    • http://darstin.com/userfiles/files/dajaxapuzozupiwe.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e05b488a78e2868b97f322c2f6882733.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/lexonavujosipu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/37774422480.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2v2jkaftemg3mdo0qd4hg2csl6/32269938327.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/11608527529.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/supugodowofewaz.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nukezo.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/81e8ed16dfb971a3cf727da88c836be0/xizezo.pdfIn PDF document text
    • https://robertbah.si/files/file/73322298825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cumulative+review+chapters+1-8+answers+algebra+1PDF link annotation
    • 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_off0000b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AA 14968 bytes
SHA-256: 121ee989ae7c087025335fccaacab80060c14fd2470700df2999024f33526abe
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 11416 bytes
SHA-256: 9f272902c793ec84e0552734528ea2879bc4fab96fa43a7b778152b12fd48fb5
font_02_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1