Malicious PDF — malware analysis report

Static analysis result for SHA-256 18daf38a027dc65d…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 13:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec8deeba3dc7df1d5a3a78f6df60ffcf SHA-1: 696565d4ee350f5552f46775529281e969b10e6c SHA-256: 18daf38a027dc65d6b2e7182fb6c741acbc78d50eedb08fde4dcd47fbdd46ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c570da7d2f3---81839034195.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a984f0fd24---xudawavij.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c02aa11b4---56032295672.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/tu176ao6fbqvmrvvrg406stcvq/21146240389.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae4909d15c---61495302509.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/dc7669d9bd8903dce3b3712d5ed51642/8764299125.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57122f00e2---fetulopagiratuvekonen.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4494fd4f---9308351281.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/tinozigam.pdf
    • http://infinity-pro.ru/userfiles/file/8452834849.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc79ad771---11530453763.pdf
    • http://akinmedical.com/uploads/file/wubamowubewebitopabazo.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/piredigeleruzi.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bc8jj007jgd76o5p2crl630ga6/fujinokivuviwizaneneligus.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ak9r0p7jk79795of5lo9u1oo4f/87467186492.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2347c562---gejazoserekudabimipugixe.pdf
    • http://morgancountyoh.com/userimages/2352439590.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608089f90ea41---63264129517.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ddecd9c11ecd6852c87b2bf8ccdedb2a/jigulonu.pdf
    • http://akkoryazilim.com/userfiles/file/zarigubip.pdf
    • http://goldartline.ua/userfiles/file/jixijupawevefanimimidi.pdf
    • http://aliceinformaticasrl.com/user/pages/pegofurexuzujubuwumipe.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0a936dfd---53135524872.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6207d1fbc---lawal.pdf
    • http://archinfo.ru/uploads/file/vepajetatogivumogike.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ct+scan+of+intracerebral+hemorrhage
    • 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_off0000f49f.bin
1e7b5e3f9b314fd252d725c0287e9dc35780cae423d5b605eca02b0f4df928ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 10956 bytes
font_01_sfnt_off00010ddf.bin
931aa3a8ec3506aa264e8fd036e31694b769e3da51a51b07e65e77c04cbe0621
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 16808 bytes
font_02_sfnt_off000138f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 16792 bytes