Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fdcfaf0d0537d0…

MALICIOUS

PDF

71.4 KB Created: 2021-10-05 13:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ef129075b2d7c033319cf90afcd2aa6 SHA-1: ff5c39cf841848cb070ee83f33264acb4e6cc050 SHA-256: c6fdcfaf0d0537d0fd30e6482f9abbc658530c01a48dd20ec1cf4daae61aad78
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised websites. The PDF document contains numerous URLs, many hosted on potentially disposable domains or compromised CMS uploads, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161538b21cee4e---32641311372.pdf In PDF document text
    • https://wupaojichangjia.com/d/files/67839083873.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0ng3c91f7f69m4rn47iqvinv3q/sabovugagezarugokugonav.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/53850263062.pdfIn PDF document text
    • http://reylab.com/userfiles/file/vuzikunowezaveju.pdfIn PDF document text
    • https://preciseenergygroup.com/media/41497346418.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/52451725351.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/temexu.pdfIn PDF document text
    • http://baoveantam.org/upload/files/temezuxeja.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/tazixowam.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/fisuvasetimureronaruxul.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614279a9490f0---72993369110.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/72416018227.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0586a75c1---86317080177.pdfIn PDF document text
    • http://pronobile.de/catalog/file/foxewibebesosupapes.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/989ff037a3be1e9ec8414a27443d24dd/gugazitujafewig.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/duniw.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/morokipob.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/leganebex.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/telugasomipeno.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tivibodekejarigaparu.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/kepavu.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/66730610442.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/99497507255.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/38540830761.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/dosajiruwesekazow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=artist+of+the+colosseumPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/64035633841.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_off0000b63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63B 10416 bytes
SHA-256: d15dc6d674ca2a347bf8297ccea8fd07d32ee167cd905c429d5259522d8ff797
font_01_sfnt_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 16636 bytes
SHA-256: b25b93a302e2224ae92501ae9459aaf0d8a8615d01776bd791e8faccf12ecbc2
font_02_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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