Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3389712e2539405…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 20:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6022cc11770396de298d0b7c8fd558a7 SHA-1: 21948992e5b1b6a3c8fbd07bbad9abad8348c8af SHA-256: f3389712e2539405c778b85689cce72935c22e820750dfff655ccd5acc9e1362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=human+evolution+timeline+years PDF link annotation
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/8da3aac5e5c2aa4b0f50a5327266ab33/xedexigo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/c97911986fc61a0ec52aed2a63316aa7/45457803687.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083162c85a2c---19206832679.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0c43efd7d0906df1286b93a6c5d09973/72525204313.pdfIn PDF document text
    • http://biosite.ru/images/news/file/pefukavanefet.pdfIn PDF document text
    • http://belst.by/upload/file/82939560988.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ad6791031b36343a3c2933ed34387dcc/1963127903.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q6j2epatrv9kfjh8fbhln53d23/21418296364.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/21258fe7b9636d8ec326166ab049c987/relikalutonawodexa.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/nixixiwidepaxonibojevok.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/gumig.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/o0dbo22441f4mi370ck62ki9j1/89559839069.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e70b61e9e5c0cc007914f073ecde2667/4445122747.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/frm0s64aibe03nq0glqj0j1jhb/kuzasiguxobedizo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520132231221708.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/jolapezabenuk.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8e201c919518c480a7ee76cc6563e730/xudalefelud.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/38066459051.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/godepu.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/nijixapo.pdfIn PDF document text
    • https://ivanamihic.com//files/ridefaxizenonixuzatewaxu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8f0fc4213d329ddee64b0b1f609e43b8/lozelizitudumamab.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160755f124be00---67336195154.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/70407955817.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 16392 bytes
SHA-256: ee85ce4936ee698ae32874f590c27cbcbc233c6b2a3a2215e2b9755243cf6aae
font_01_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 10540 bytes
SHA-256: 9de97275a31dd576a8710f1ae38037e6bf7609017395e63f8aed045ee962afae
font_02_sfnt_off000130b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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