Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ec8bd0da3bf8cf…

MALICIOUS

PDF

89.1 KB Created: 2021-08-05 02:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f68d9dfa7de71eb839b6ea2f3a41b8b SHA-1: 27001585657941e1b7c3a278caf1cd35cbcf07e3 SHA-256: f1ec8bd0da3bf8cfb26e3d2f16f266deefd5b2e6dfc8054301a7a27d42d1d97e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users through a link farm to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=simon+vs+the+homosapien+agenda+movie+tie+in+edition PDF link annotation
    • http://falerisztika.hu/tmp/47359551301.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb96526e3b---relidebo.pdfIn PDF document text
    • https://bursac.net/userfiles/file/54243620221.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/14049771546.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083793c50e1f---60631620658.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda5fb949c---18987110240.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e5ea74893---20916663084.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/fuvov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a0184c0fd---76296232437.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/getawujamuso.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/82826145561.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a984fd59d0---bixodekobotogixep.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e925e5da6---doruwomorizitasa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1e48ce9a---poxeremetufoposo.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/lureb.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/7637645477.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/bigara.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/rurodilibobofo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e65609245---zanapovezorokudufen.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce8ad0262---boxadezapawizekamunosa.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/50933533928.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c8edbc8f---27667121361.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eac2d2553---temunalaromikusodefamop.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0cebc28e4---38045934307.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/xugimivinopu.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_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 10836 bytes
SHA-256: a8298e73516f73a6c205882fee38ef52a4dbaae8b183d76df6994bde77badbae
font_01_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 16896 bytes
SHA-256: 5e96468ad88a492413b12f886e6ee9f4eb112b25320539205d1b13f1e7390ff5
font_02_sfnt_off00013c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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