Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc99cb6209e978c…

MALICIOUS

PDF

76.5 KB Created: 2021-07-02 00:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db54219763c875ec6fc9d427693b072b SHA-1: 3d314c50a6590f1d35a5cb7982d6d8d38f54cd3a SHA-256: 5bc99cb6209e978c45835ad68f0ae405ea0b376af5f9e6ef682938ce72c38b73
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://fixafilm.se/userfiles/file/tugosuwefutididotax.pdf
    • http://al-bandak.com/userfiles/file/tulawetezivonopuvavoxuvak.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d7fb090e898cef143864ba143162d085/89282150420.pdf
    • https://chpcentre.com/files/file/6286513634.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160714235bba48---gavabatofawupadovumevap.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7775169bfa---94398534842.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb79bc79323---53621325670.pdf
    • http://naturallabs.de/userfiles/file/11974225711.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb080027ce---xajarozixegovomas.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c3a58455---kigumisiwo.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dcc838d69---38085307488.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ced61ad85---9845073510.pdf
    • https://emauto.lv/index/images/up/file/fuvututazobibigavazutijep.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e87e955ed---52261979936.pdf
    • http://ascensionchina.com/userfiles/file/xasuwovizimotukewa.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a2641aa9cf6dc6e2d9f234a30bf72e25/82606665935.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092b389672be---11861463864.pdf
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/zudexebiragagudigalisu.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5m5nv0leb2gcu7rn2sr84itvg6/dajofobadimonodegigotod.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/60303261774.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c19c4740---5818473662.pdf
    • http://steakclubhn.com/campannas/file/65919278272.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=attached+as+per+your+request
    • 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_off0000cc52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC52 16792 bytes
font_01_sfnt_off0000e469.bin
163946a9fd8f302f97927848daf8433d48489de6bcb1e40572a6b5a2e47bdbf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 10712 bytes
font_02_sfnt_off0000fcfd.bin
7d59c6f2283e86b8542125406fb202087a8771a8eeee747ae753518027eff259
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 15980 bytes