Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc88971637f3f14…

MALICIOUS

PDF

86.6 KB Created: 2021-07-25 08:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4805a39e6a2cd6fb44c9998e7ab98e5 SHA-1: 94d89a47f72f5a09e941d52927a605f8a566c7d7 SHA-256: 9fc88971637f3f14b8c60f24651287e313421d4219a10467eee206c5294aabd3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs hosted on potentially compromised sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038d80d3ee---97899067400.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f08cb25aff7---98996386955.pdf
    • http://heninrealty.com/userfiles/files/53629090732.pdf
    • http://sparkpro.lv/content/file/2845700764.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a963c7cda7c---xuwawupowiduvuvegalavoji.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/deraxawekumixel.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/605bc261400dac208891236e6d942581/73848184925.pdf
    • http://nadiadsa.org/userfiles/file/sogorag.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/52543228c5ef3ae379473f4604f15a56/69528161705.pdf
    • https://bawwabatrizq.com/userfiles/file/4718356259.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e76a50f8---28245378284.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d69afb2cc1b---juzarerevimawoporudadoku.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/jipozakub.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/400ee0bca942a49c6cc5aef5bc1e13b3/44739064890.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1b14a790---62106188078.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb7837316f---kerenosaniz.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a37cbe37da4352a8e9864127004c2c2f/petusejutabima.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dfc5e55e1---vitelowuluxafo.pdf
    • https://pjkconstruction.ca/images/file/vebijewir.pdf
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/57462526844.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/62ab1b240235710afd307ad02c4d0a4f/27119012681.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/34888814354.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a708849c3---53943124787.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/568c9b0739a8d90793825e89ab20a544/36688041570.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+does+a+hydraulic+accumulator+work
    • 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_off0000effe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 16792 bytes
font_01_sfnt_off00010815.bin
5c0121d5b2284508bbb11a448ec15a21d802215fb1b204a96007014fe3afe0d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 10912 bytes
font_02_sfnt_off00012167.bin
e43872af95f7d945bfebf4d25d1cda1d044ca6b2644f9a5b3b4452e7fa974f50
pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16728 bytes