Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4ea27fe9d7d8d1…

MALICIOUS

PDF

88.6 KB Created: 2021-07-05 15:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9ec537633bbcb04bfee9845355f5e50 SHA-1: 36a21be56d78a48d662268a0d96d71e7c7e59093 SHA-256: 8e4ea27fe9d7d8d16a94a5d4e55c4674d93e13bb379c6df85db5352ae0e17af1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://self119.net/upload/userfiles/2021/07/files/210705101711.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3472997985---wotivakape.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e838d105d---sizudafawejotiwufodafifin.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3917ef0489---bupunuk.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4812469f4fa5afd0e5627a29aa5becc7/15333113879.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2c6dd5d202ed247132318b98820299a9/43233025645.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1b73ba7d---deluk.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/55a53dd21a1fe827c5ecd55515343590/50212253189.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/33568753681.pdf
    • https://nikosdimos.gr/userfiles/file/welolovefemaw.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0e07030e730a45be6b513fa0a3b977f7/butugubunufekol.pdf
    • http://dmhu.eu/uploads/uplib/file/16636836671.pdf
    • http://sharise.net/Uploadfiles/files/ronisonirasaniwexudesu.pdf
    • https://espiber.cl/images/uploadedimages/file/xaxod.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a6a774c18172da10149ddff42753159b/25363273421.pdf
    • http://esthebel.de/userfiles/file/fubejutomuvirugepumilo.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd4a31a2aa---10463340837.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077173453eb7---midapulibov.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b64180a8c---12571220509.pdf
    • http://yangpupark.com/uploadfile/files/594845760.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/bb2fed3a923fddc49a03474a4c6c377f/16431770613.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2d58b1dc30853c1602302b5214741cbb/xaxumarifoziwazaje.pdf
    • http://assushop.com/userfiles/assushop.com/file/75618097867.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a32ae195c4f391934b6a9f911b8d393c/silatusaporusaximalik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dean+martin+songs+in+movies
    • 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_off0000f73a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 16792 bytes
font_01_sfnt_off00010f4c.bin
d3fe300377b01153fb10c23208678453aa2555500123af73911eb4e85f9201d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 18036 bytes
font_02_sfnt_off00013d9c.bin
84f936a7e2de9d39bcaea78ecb480a41f9beec3df760f3807177d31a149b89df
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 10472 bytes