Malicious PDF — malware analysis report

Static analysis result for SHA-256 931b73ed74b46168…

MALICIOUS

PDF

151.6 KB Created: 2021-07-07 11:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e5c158b78441983251fb9e62e1c421ba SHA-1: f09d452daea40b167ee7416de80e5fa288ec95cf SHA-256: 931b73ed74b46168dd6c19c261d14fa65bf697167575751e5b872a2ee2b501c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The numerous external URLs embedded within the document, many pointing to compromised CMS upload directories, suggest a phishing or malware distribution campaign. The file's structure and embedded links are consistent with a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://allytemp.ru/uplcv?utm_term=ethiopian+government+accounting+pdf PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608116e9a215e---90368588501.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/pibagun.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/4476293235.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e15671a371c0994fd8270d2911456e3d/bitovuxitovuguxutinifepow.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/14551198612.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/24a28ca7a460d8f833f7b476a2f98d6d/68356576381.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f728b0eefe---51878991580.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/50c611d53284f089dadcdb8fac8f7df5/3310956624.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/xevadazubumirovubov.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ba556d20---nizalagas.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160771e19ce998---funolobamatofirelurog.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/76460419421.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/rexadizejisigatixa.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/79d1f5cc9ffbd90efe42db11a8727971/34582125840.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/77225888568.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8113cc3f---97509990999.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb508a0fd74---95067560866.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4878e695892df5233890bb6e68a1516b/goxudib.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/d5a17cafcc1e8a7453365deb6cfee39f/94082336310.pdfIn PDF document text
    • http://indel.sk/userfiles/file/kisopogatubetovubixitimux.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955b3e4eb---81845785781.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eafffb9f21---wowaxogifobezexekovasizik.pdfIn PDF document text
    • https://peterdegendt.be/file/27978485839.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_off0001eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEA4 11000 bytes
SHA-256: 049a27b2a7a07df143c2fb82f30b08e3501f1c65bbc8d01798ff64a67fd320af
font_01_sfnt_off000207db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FED 17844 bytes
SHA-256: 539aa36a1222beb85f0d08f7e4be8a5fc1fbed520204d1d443867a495b6f6edf

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