Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ce39b24b6f6473…

MALICIOUS

PDF

85.2 KB Created: 2021-09-05 11:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8227c4c241774f5f2ae159ba510fd3d9 SHA-1: 82dd5b337a28eba6ce9d1d5d68152be8c97872ae SHA-256: 13ce39b24b6f64735dba31c3968f2e53c0cf89b71bd7b290cf599c6216b712f8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092472091e76---16934726622.pdf
    • http://giustizianuova.it/userfiles/file/ropeti.pdf
    • http://chromatographvials.com/d/files/kamamolebujal.pdf
    • https://fortworthdental.net/cmsCart/upload/file/59362192282.pdf
    • http://tecnoservizi.com/userfiles/files/82300458207.pdf
    • https://moscowfashion.net/content/xuploadimages/file/59349514023.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xurazurulutijuvekerujiga.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cf56733b---21962371525.pdf
    • http://w-f-l.de/user_img/file/48948905831.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119a2fbd23ba---wumewodajamomeribugaj.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/xutonenafivafabimevoga.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa0f26b0c2---vutodewelubivokalakalime.pdf
    • http://daiichihr.com/uploads/news_file/92459314188.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34fd29e482---54557140832.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pq58taf5cs6es124mot5lajitm/75424822511.pdf
    • https://astdubai.co/userfiles/files/84107859046.pdf
    • https://kristinanamaste.eu/files/31212336285.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vr0038vfdf8dhm9t380bkha9u3/sepodenuforobadafaruzup.pdf
    • http://bodegaadrover.com/userfiles//imagenes/94798505006.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/niferavoxudubixop.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbf439a99---lujavexugaviwewesuxen.pdf
    • http://border-inn.com/CKEdit/upload/files/37710166488.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e163149db2b0851352445b0963ac0b9e/valojejixoz.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/30314968294.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=manual+transmission+fluid+gl4
    • 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_off0000e7d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 16792 bytes
font_01_sfnt_off0000ffee.bin
84f109fe17fecf797d1078642c0e1d920e91d394775e83a2a72a1d416031b6a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10736 bytes
font_02_sfnt_off00011860.bin
a7bbf257fb6d0fe15f88c4ab1b02f4c2341eff0b37ab97c92476c1287352fa3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 17892 bytes