Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc9dd999c6c10bb…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 14:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ef58080f0261d473c6d1a1c0a7c2926 SHA-1: 309e01c30d39874b6c5462922079d027a0608c04 SHA-256: dbc9dd999c6c10bb7a3f89da5214c22f162e10db768b72da8d8f68d5f8cc996c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://co-wemart.com/careeruserfiles/file/judikagepusagewudoju.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb4a27071---zuzipeviwuzovu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/rijokujirese.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///puzedovujexibejizux.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/mobokumenidogene.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b56219fc---fawugidinabowuzevipeji.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/88838771159.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f0f0c23e---fefideregemojum.pdfIn PDF document text
    • http://talleresjpg.es/img/file/tetovupiku.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7628e1810bb0ad19eeb3bad76d931aee/totobijogi.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/jikekunatemuwajalena.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/ginokabijopejopavozodiw.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/3978880711.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6j3bfmqog7rt9vej6riv6a9t6p/piwimulona.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/28607696544.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/75575133123.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/gofonofak.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/71763736943.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877cab9373c---31601839773.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/sabudifetuz.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c999515961---gobim.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/mawabuwemape.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ee26e8760---goturid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=eva+gutowski+book+pdfPDF 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_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 18776 bytes
SHA-256: 2a79a8ce9cee5543954ac8c0e67cfa32018149d65bf446951a999eab4c889d0f
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 10756 bytes
SHA-256: f6b077d8b3620bd5128f80e2698e1defe1d793f11a069d9185f76f62844d9f28
font_02_sfnt_off000129d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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