Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b87db18cb7a57f9…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 05:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bc4d4c5bb62a0c89543263493533ab4 SHA-1: a71eddf1ebb7a754650863c618943193f2eb227b SHA-256: 1b87db18cb7a57f98755feb961e20ac6ef8dec4606a882799e33ff109b785620
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/i9itr4ujasp13dhutm5s300uh5/83114397587.pdf
    • https://macronew.com/upload/files/95699637015.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a3820ebd62fef86b5c99ac28232a343d/9488972841.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f74b74a564319a7efe55747c625bc003/79045532606.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/gobewixu.pdf
    • http://garmagostaran.com/Upload/file/dorejanefep.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe14082344---forefuganepof.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b143671540---mawunanipasonapi.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a03e48fde489d1747507a6f229d0f8c/mamidagepunuma.pdf
    • http://dycelife.com/userfiles/file/3243437622.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e7b94f0f07f99cab453d82c9a9dc2e8b/66381693156.pdf
    • http://elma1.ru/!upload/files/65392562887.pdf
    • http://edu-family72.ru/content/images/uploads/file/gutubezajekemeliwe.pdf
    • http://vizugy.hu/uploads/files/89727790931.pdf
    • http://consade.com/userfiles/file/zukirux.pdf
    • http://jakpaisanestate.com/images/upload/files/nofowomefow.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/9f4b22e9cbd1b8a2ec8b18a58ee7c056/75627646753.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/41436515928.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9548bb6fa6---zezivazulunuwa.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084530c1b54d---fobezolifuxavosamu.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/47174337254.pdf
    • http://cokhisah.com/webroot/img/files/78727407862.pdf
    • http://sugarfree-gelato.com/upload/file/dunajupijafaxim.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612903648ad0d---tufutu.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c99b2f2f4a3a654f458de34a798b2552/34837586518.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7744beac4---gizarutafoxabovabifujidoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=difference+between+consonance+and+dissonance
    • 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_off0000eea6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16792 bytes
font_01_sfnt_off000106b8.bin
9b94964aea0d16bfa224783c050b7a33a0464fe3eb60204087288b77ca954401
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 17820 bytes
font_02_sfnt_off0001348d.bin
4249cb70d01cd00cec1189bba6b8a2fe5d6dfe20f2080b5360e04f2a0346f72f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 10652 bytes