Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e1cb143ee70357…

MALICIOUS

PDF

73.4 KB Created: 2021-09-26 20:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f99ce1a79841101757559ce53ec3b086 SHA-1: ccec9d461c14a6b050cea9020188379c2a8461e8 SHA-256: 28e1cb143ee70357a26ce4e8bfb71ae528c0d9a7cc0a5be456947f7c53cd41be
124 Risk Score

Malware Insights

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

The PDF file contains multiple links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. ClamAV detected the file as Pdf.Phishing.Trojan, indicating a phishing or trojan distribution intent. The presence of numerous links, including those on disposable hosting, suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4897

Heuristics 5

  • 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
  • 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://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f69e0900743a1ae1fa8a74fee5d1ff80/27875366735.pdf In PDF document text
    • http://cafegreenwichvillage.com/uploads/files/68341063691.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/bexunedusakapenekafofod.pdfIn PDF document text
    • http://119pump.net/d/files/22233702723.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613989690bced---bivetuvesovigafazub.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ff612335d---30299868414.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/daziwapazexugoka.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/vijoluvu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a663ec2f80956c8c4082c191c46df342/33858984762.pdfIn PDF document text
    • http://dgkno.cn/upload/73367256857.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/48742908811.pdfIn PDF document text
    • http://lizhechem.com/upload/files/nelexixezuvuputerulizuk.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/geparupojavubab.pdfIn PDF document text
    • http://eternaseguros.net/files/files/leximafa.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/xoxonizirajarakuw.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/daximetazu.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/falos.pdfIn PDF document text
    • https://intersat.lv/files/file/nolisibitovema.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/44616261857.pdfIn PDF document text
    • https://ratoempat.com/contents/files/xanemajifezujijelux.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614c621f53ac0---zuvateganaramazuge.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/85182273057.pdfIn PDF document text
    • https://afayl.com/userfiles/file/21262497711.pdfIn PDF document text
    • https://sealskinz.ru/files/file/vukimukukanixanowigol.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a4ff271cd---46889362443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=heisenberg+model+of+atomPDF link annotation
    • 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_off0000c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 10828 bytes
SHA-256: 2293a56c4729a2ec72904d2febac405034ab1710f2d70ac0224836914ae54818
font_01_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 20308 bytes
SHA-256: 16448b57e2e1628947f61897535d4d4721be312e49734ce210123baf2e35cc8d