Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69d554adb2cf31f…

MALICIOUS

PDF

88.3 KB Created: 2021-09-08 16:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 050d21eaf6bf1be80ed501bac98ec895 SHA-1: 5dbb5e5eb80bf91f5e1ecc1b40a36b2fc29011d6 SHA-256: c69d554adb2cf31fc0774a76361c4d898d1eed3aa990c1c82f70036243b0903b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, many of which are flagged as compromised or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://caycanh.vn/images/fck/file/wizixogenosapif.pdf In PDF document text
    • http://baovethanglongmb.com/upload/files/sogem.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/78932917988.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70795752061.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/tudebitebaf.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/80828667036.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/14362682284.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374509eb6dc---xesovabolinanedofodinug.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/89374552857.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/wowadikokibo.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/57370479546.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/kefojasukugigekegedepusir.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/71150245347.pdfIn PDF document text
    • http://tianfonmm.com/d/files/karixusazabex.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c524d07d4---2931042343.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137ddee54a85---88221081419.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70101733891.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/witonopavozan.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/tedipiwas.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/resasojapibedenajuj.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/44368797253.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/41550494405.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/81709656910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=install+master+pdf+editor+ubuntu+16PDF 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_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 16348 bytes
SHA-256: 6b314c3c44cbab07be5e631155e952e4b6c5b327c675dbcc5a966b08d15933c9
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 21724 bytes
SHA-256: afe9149d32113c2fd0e1c4077b79f8c70a57f9cc200fdd4da5b141e195778afc
font_03_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 11072 bytes
SHA-256: a67ac7801d474464bc490770da70077a2a0f2d78b30309792076084ad281954f

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