Malicious PDF — malware analysis report

Static analysis result for SHA-256 153cde081906ed27…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 03:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93449c76483194101f01c817ac8b7aba SHA-1: f3f55028a3b4c1c3f73554e021afdaa3e784e76c SHA-256: 153cde081906ed27161413604b3ee3750cb3c5a41639dbd90ddd7fe26c546782
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, directing users to various compromised or disposable hosting sites. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=kanji+workbook+pdf', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://wastran.ru/uplcv?utm_term=kanji+workbook+pdf PDF link annotation
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/pegurivaje.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b195bc75bfd---wuvidiberejopuj.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/22900372196.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/tokevolokuxodimuda.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/bigozigasafito.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/kuvan.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/lebegisodufavabefozik.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c3d65c9c---66688064287.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c3893e0df0c3921fcf9140966050b6e0/zidove.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/nogexezuveruz.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/54568189484.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/kabizekosaw.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kikekezifamu.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/limulurodoxevifajefelab.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/24799481314.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f0419e72c16---rabaselakosemesusixad.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b01ef02b843---35453214784.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/wanixopimelugoxolojelizag.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/53073552590.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07bdc18e6---vozesusakuk.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/zefotewoles.pdfIn PDF document text
    • https://faceless.me/userfiles/files/werizufuk.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b12420bb6---26915882454.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/592fc020ab71cdebf4dd5a0250931963/28098029040.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/64246501653.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8737e12c5a---65102879285.pdfIn PDF document text
    • http://isgsrl.it/images/file/46107668801.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_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 10484 bytes
SHA-256: a219a6b0deaf46f41b5156c96178358e00565145906c4fc8b732b35946691a0c
font_02_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 18308 bytes
SHA-256: 64fcf745a11a0e906b07678f42fa32ab29a54acf042ce888c46c00c4a3b5be48

Open this report in the interactive analyzer, or submit your own file for analysis.