Malicious PDF — malware analysis report

Static analysis result for SHA-256 faca7cdc52577d48…

MALICIOUS

PDF

84.7 KB Created: 2021-08-19 10:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7096365ae125d62692b5ae548f493f53 SHA-1: 8c37bb9f8eb2bcb42ad5a9ea142f4302901f05a5 SHA-256: faca7cdc52577d48b0383e50672c4d4a148cbb108478d9fa76e0b32358555005
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://oniceh.ru/uplcv?utm_term=how+to+fill+out+employment+eligibility+verification+department+of+homeland+security+form
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee113e9b1---34803625443.pdf
    • http://aktifithalat.com/resimlerfiles/lifuvopomavi.pdf
    • http://nanumed.ro/uploads/files/xagulewojax.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4a075825637307ee998da12c9217e4f7/wemepunakej.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a881e9a93db---13800169775.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/r6jc8s5a98d83tt1npeoi15rn5/ziwaxuvegoxipad.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3ea76f5001cf2943a732a48f6c290e8/13518896082.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jumes.pdf
    • http://anshan56.cn/userfiles/file/162836745890309136.pdf
    • http://podiummoda.ru/userfiles/file/dewikitojatufoxezexada.pdf
    • https://aldapa.eus/files/galeria/files/luwut.pdf
    • http://jdjcnc.com/upfolder/e/files/20210714034705.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa20141c293---99170685277.pdf
    • https://tumujerrusa.com/userfiles/21697033964.pdf
    • https://trvstore.com/userfiles/file/50407707646.pdf
    • http://healhumanity.foundation/userfiles/file/latukolopubafuxazasasiv.pdf
    • https://dm288.rs/slicice/file/75163541664.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f84beb83b9440bc3da8a210830cd715/39881009788.pdf
    • http://lahma.pl/_u/userfiles/file/672661975.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffecb7e7ef5---36148002257.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/62849979c7761ad30a0c00eef84bbfcf/lopenedid.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecb85bc54---warozuminosoruxemel.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/ludagelisenad.pdf
    • https://motelandratecuci.ro/userfiles/file/vanalugovufajefarawasaka.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084148bb5fe4---gabilija.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/binokupusitalex.pdf
    • 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_off0000e534.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 16792 bytes
font_01_sfnt_off0000fd46.bin
5c827b3e6f5c560adec962cc19cfc419395b38d80cb4dab0aec9319fc564c469
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 16648 bytes
font_02_sfnt_off0001286e.bin
faa76580f3c8751bed468fc4eafc8606b31fabf7f7c997da86df296884d5349a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 11564 bytes