Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d9328d12b4cf0c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-14 02:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 88723377948b78dccc3313bbb3cd7058 SHA-1: 344693ec6c9ba2a798e567b2496353f0567ddb78 SHA-256: e4d9328d12b4cf0c1fae708096b23abf27533a65fbb54be7a7968888230bd7e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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 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://ndmoyun.com/calisma2/files/uploads/refilagukesovemivasuzive.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acfef37002b---26221446476.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90ca8e7d2---dirutujof.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/fulifesepugudamaratat.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/jugimeda.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/86j3ij0nb6no0dq8utmacfuqbc/26655087806.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/jojuri.pdfIn PDF document text
    • https://menu2uplus.com/images/file/12520505551.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770271d91fc---zarinufadubemaropifowip.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a98909f5---8749058591.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c142033def---pusumufokufegeri.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/62ead659fa24ad113f65e4fc5b0a8918/dibesoduzadatezakol.pdfIn PDF document text
    • http://chromoink.com/updates/file/42762539158.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7f138celpp7sdlsmkfci1d2f0/nevajexenoganokuxofadiw.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/tanenanoba.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/18583459659.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/819294390.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/671660bb3dd6919f78cd73a8947cf2d6/pekovewizipetirozakosu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cba6509644c---54075849174.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/66115655240.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/memikepemiga.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/nm9btvnggnvatt9jg4g71njmkn/merobode.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098caa0a525b---54885858052.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/movezakonodatanuzojalul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=quantum+150m+wifi+dongle+receiver+802.11+n+driver+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 1704 bytes
SHA-256: 2d59b2b1bb9a6f9bbf889029c1db5c2207fa4dbd30617e885d593f86b64e3e7b
font_02_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 17672 bytes
SHA-256: a34829cfd08452b429ad074da32058c4f4c2f30a91ff1130d87960ae45030754
font_03_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 11664 bytes
SHA-256: 83b2021a551f4a755c153b11cc3c0e674f4e18a0e5998df3523730218d70e99f