Malicious PDF — malware analysis report

Static analysis result for SHA-256 7856917cae5fad42…

MALICIOUS

PDF

78.6 KB Created: 2021-08-21 23:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e5825378d0a5dcb8c39a7e5c6221f3ed SHA-1: 2cdf3ec102484a9f271a8febe8f65e3d87bc7b4f SHA-256: 7856917cae5fad4242b4638805c61a996a5ccf0b3b59be6e5805b4a193087672
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071996dc02ad---segemekedezu.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f0e5ffeb---xuxezakuzapolevalire.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/dodawomefoniwuzesimilaju.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/3e16be3fd9ed09021037c2d5cdf06599/zadudojenif.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a23bcbcea---24013994192.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e0972ff8---17468622874.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/91739018193.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/pijafube.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vumos.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/60790120270.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/84742032951.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47fd6a4ce---72212077177.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/d1rm14knjsq41n89p88sq6spu2/jirewogiloje.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/35385537525.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/63586856898.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a9d113ff0d254dbd04031c5cce287970/16129146496.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/s9qro2kc92eg6a4ihhu4f16q57/panopipaxuxafibuterimubaf.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/fqds7266bgtcds5thpqnk186ta/filew.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/vedusagi.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/5823065102.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/vikisupovijax.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/6281766325.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073bfbe4ea44---bodegumax.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa23b8ebe9e---24770524841.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc2766ddb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=zombs+royale.io+unblocked+66PDF link annotation
    • 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_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 16356 bytes
SHA-256: c4027924ffb6ac6b50fc3d329a048a7e7224da1b88a8247f02c4ebcde7747eac
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 11076 bytes
SHA-256: fe55267f0a2f8bdd76043d20010625f30e66adb81f2b34ddfb4de36297047f22
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1