Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eb394a88b0c003…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 14:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84c1b5a147d67c8c685401b1cda3c604 SHA-1: ad487dac1d33547826bb0a4821c475f61807e30e SHA-256: d1eb394a88b0c0037bae92947172da2e9efca4808782d9327a243f60e39b838c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, disguised as a free download. This is a common lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://novichiha.ru/pic/file/76040898850.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611034a0afc56---xisesow.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c661fca177---44349005941.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zodiril.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/zuluxural.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e59a4387fe3---46797716688.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/80441006159.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/tamajutobusuz.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/11832932356.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/36457852720.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/24354bd1a5e8b6365a50026e844dc70b/58324656672.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5fpjnse2oc64gqlj7st171b3vp/kiposozurejosen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c45627639---57017910835.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d43a79884---38856080138.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/52611064552.pdfIn PDF document text
    • http://fedime.org/imagenes/wexemitar.pdfIn PDF document text
    • http://axwelindia.com/uploads/17761500603.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/9sq85l6q1fif8eidf9dkf0ei3n/38299154236.pdfIn PDF document text
    • http://slsnn.ru/content/file/96895823907.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/makufixigurowa.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/jetoj.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/furakoviboxodepumiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=adobe+pdf+free+download+for+windows+10+proPDF 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_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 17460 bytes
SHA-256: ab033cf6ab186145582e9867fdd963a42ea03d3916b0355ebff1f4189b42d20d
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 10776 bytes
SHA-256: ff3857dc52262dee3b6ce92c000712295be4befcc316d766046ac8d81d045508
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1