Malicious PDF — malware analysis report

Static analysis result for SHA-256 6609894ce99f2d53…

MALICIOUS

PDF

130.3 KB Created: 2021-07-02 19:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da293c46b15c2a79959863026c02c962 SHA-1: ede0e5cf7ba1199cd56ef89c5a2dbeac50062277 SHA-256: 6609894ce99f2d53a5c75eb36bdbf0794fdddac5807c2e1be0c51f00ee3bd245
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a lure for phishing attempts or to redirect users to sites hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=indian+classical+instrumental
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/857663460470f5d4a33707af00a1a0b7/bapikapuxejejefug.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/wodejurodifanonakuro.pdf
    • http://atthaya.com/file_media/file_image/file/vaxufidosatuligimaw.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc913c8b22---38094289235.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9f67b9cdea8fe2d2e782486cd11b3e05/3228232351.pdf
    • http://bogieclassof67.com/clients/71235/File/munase.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g0kp7u95jcf9vnrej2hlolcd5t/pulolumej.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094afe446775---zalimosezenugug.pdf
    • https://wsbtitan.com/images/file/dasaduvirigukejaje.pdf
    • http://suachuaspa.com/upload/images-content/files/sujibefu.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608194cd137c5---jorobujekam.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/dc3c6acfccfe04f3890cca5ee6778467/22183325312.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b693a79fd1b83b7ff402ca74431cabf9/benenala.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e21b6ba86---41874908189.pdf
    • http://whalesart.com/uploadfile/file///2021051910074866.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc5e1ee6c---76526730399.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d596b0c444ccee215293ef6d42e37d10/7861177434.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bb5d24e9---migiku.pdf
    • http://simonide.org/userfiles/file/sodosiwejuv.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d7015e426---49064393552.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/043fce2d09024ab054d2ee680a9b3c4e/gagosozixewagowosilidaw.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/u76a3liu34pstc9b6benanguv4/kejametasinororapozoreso.pdf
    • http://murasakijr.com/uploads/files/lulutobujuwigejadiribiw.pdf
    • http://mikailang.net/userfiles/file/20210512023615_1544617454.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_off0001944b.bin
3f85775bd00383d0f755a0d263a2569d6e1ac17c1521c732ec81070a0ee9ce7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1944B 23284 bytes
font_01_sfnt_off0001cbd4.bin
ca4d19c104090a2a5c87eb8653c47b1324b38d580412bc2564061ee8b4175c46
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBD4 10460 bytes
font_02_sfnt_off0001e38c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E38C 16792 bytes