Malicious PDF — malware analysis report

Static analysis result for SHA-256 c682691c331a6b30…

MALICIOUS

PDF

94.9 KB Created: 2021-08-27 02:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9e6c4126055bf58e6750070fee40d47 SHA-1: 296a7ce6058ab9d9067b07f755724770dc33e412 SHA-256: c682691c331a6b300d462dfe6f53414f7c69028f27216fcd37687678750ce74b
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, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://jullien38.com/ressource/site-image/files/62266907572.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/307d202c85a65a3b23a5f1d7769bf34c/91609885561.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/e274d01d38c36635d92b987367a37d4a/kavoxejewug.pdf
    • http://oodow.cn/upload/file/21070200293572919954wsmarm97t3.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2dffc9bc7---29261573867.pdf
    • http://computerdoki.hu/user/file/94616422037.pdf
    • https://atkarisuli.hu/userfiles/file/posax.pdf
    • https://urbanshapes.in/userfiles/file/6571328158.pdf
    • http://hakkabrothers.com/userfiles/file///72733276127.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ee9897b5732---22455320092.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb68fb9305---lojagetofufojawexesu.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b683e4b48---rejojomavolavupakudozat.pdf
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/viduwagogiturafiged.pdf
    • http://nebo52.ru/uploads/files/17356941149.pdf
    • https://syntellect.ru/Repository/file/pesufajedufojumidikariked.pdf
    • http://www.deewanalarab.com/up_imgs/radatomujiremafunevosif.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4vos3uqf93s419rle40i5q19aa/24090931578.pdf
    • http://lungshingcentre.com/userfiles/9998154141.pdf
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/41195360384.pdf
    • http://twfbs.com/ckfinder/userfiles/files/duluzeragapuburamup.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b7b7326735919fa7c90073aadac9d059/dadipedupiza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=jann+lee+and+lei+fang
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010931.bin
21b32f888bf3a9861992d57d5096c7d4ec1b0741f1c5ea0f374e5c5343b9be1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 17548 bytes
font_01_sfnt_off0001368e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1368E 16792 bytes
font_02_sfnt_off00014ea5.bin
955bbf090740b00164b2f6dd161c90719c2ef919192aa88ab9f2db18b11d061b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA5 10032 bytes
font_03_sfnt_off000164b7.bin
4c2b61b8e167e682dbbb8151a158a05cceb629e48ef9a1d437e262c566395db7
pdf-font-stream PDF embedded font (sfnt) at offset 0x164B7 1876 bytes