Malicious PDF — malware analysis report

Static analysis result for SHA-256 855cb832272a7f5b…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 21:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 456321e82a4c483fb3a9a908b1384450 SHA-1: 3e2cdadd50676163821ec6772ac0aafbaad92cfc SHA-256: 855cb832272a7f5bbed5b225e1faa1e74e3a18f794ed36144e7f358f4e9e8a43
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous unknown URLs, many hosted on compromised CMS upload directories. The primary attack pattern appears to be directing users to potentially malicious websites, leveraging a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e11e8ce34---dijepajutet.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a79d9e6f8---17214624446.pdf
    • https://pacantioquia.org/aym_image/files/58780166765.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/zedanosugenujupunefotates.pdf
    • http://worthingtonpark101.com/userimages/17180157135.pdf
    • http://aire-limpio.com/img/editor/file/70063918926.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/pc2096ucin17dtovb4earjvgv2/rifiru.pdf
    • http://mnogonomerov.ru/uploads/file/wubagexofadabazup.pdf
    • https://bcbc3399.com/upload/files/bemibuvetudovavunifet.pdf
    • http://studiogiovannone.com/userfiles/files/xosusuvabizabixazumetu.pdf
    • http://habitat3.eu/userfiles/files/lixubagaduraladerawazo.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a368d295fd---pizulajodopiberituno.pdf
    • http://fandimnarodaku.cz/upload/file/43524880731.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086dcc53fa7a---49222580482.pdf
    • http://agcslohian.com/userfiles/file/rarezemakaxutopizelusaza.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/zatigig.pdf
    • http://alhouti.com/userfiles/file/bexeb.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd86f105d---62287251721.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824d4a980cc---zelazevezijazo.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/64113495420.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/bidukesozup.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/5ea7f294345121db97e96e3ee7e44bac/81143856216.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cc89782e24d---24764640570.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/u21dphg8591lrh3sacc0j4dgg2/tedoj.pdf
    • http://fygl.net/uploads/file/180902084784.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=brentwood+homes+for+sale
    • 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_off0000f0be.bin
dc4fe4d74c7ea1cb95aea3dce3ea2ccc12e0821b86e27f341679ff3c15f0292b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 18792 bytes
font_01_sfnt_off00012199.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 16792 bytes
font_02_sfnt_off000139b0.bin
b32dcb204efd776fd9b1ee890dd0e366b001024f8e8e65cb54d797b3271c3d1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B0 10668 bytes