Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c51c510518f331…

MALICIOUS

PDF

89.4 KB Created: 2021-08-06 16:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04fb4b5b67d01f76293cbc8f6d3b4dbf SHA-1: 1266e1cb8e6ec9efdf1a228bd2d7d4137d5a6acd SHA-256: 97c51c510518f3317653157771bc205f12793f23bb092167c81b886986e70a69
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://sva-jeanroze.com/xmedia/file/latadotaf.pdf In PDF document text
    • http://madmojo.com/fckupload/file/83866471633.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d89c92753---10798586312.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39ac22cf17---87162205993.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fabejapiwimukoleg.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/jujunu.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/1259271546.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/9691093945.pdfIn PDF document text
    • http://tencanpowder.com/d/files/82650766131.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/gekikovu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4607c44c4d---jemuk.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/vifqm1agim6dvsf1ku4gqit2m1/58314647096.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/71160056326.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/48507839111.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098176e41ca7---16138752355.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1rb0ghdri58mjaslvofddqvhai/xazikokatepumubekivefa.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/dufetebexidijadego.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b95acc0096b---12421936569.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/wanutemipotadalibawo.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/wuvatumuxidetog.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/421bdee7281a561a994bbc27ae8566c1/pixexebodetikutitux.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b6d5f679---lekuxobegirirakifitigu.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/4vf85o1ji9nqlbg3fv6kn2sai9/wukesafotisekevozuf.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/66675524030.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109809cba0a4---somefokubitosebozexasodil.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/27d5187e00d54791b268ef0bf3888644/38273972081.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6697dd4fee70f0d9ba463e8b86f1472c/26557238262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=solid+state+physics+books+pdfPDF 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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 17860 bytes
SHA-256: a451e99dc063108dc4777e7449082b8328a71db8b852ca9e7dde0c0cce9536a4
font_01_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 10936 bytes
SHA-256: 5d0a4c25be0cd9ebf07037cbe89e34aa48bddbe4f62b89df6bc678b703a4c1cc
font_02_sfnt_off00013e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1