Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a83a9829d8ca79f…

MALICIOUS

PDF

101.4 KB Created: 2021-06-29 06:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f65b244ef1233e1f65afd1116e1f44a7 SHA-1: 0aa9ffa7b09ae78ba4fae82525d50a624fd501da SHA-256: 1a83a9829d8ca79f8adf97fa7350dbaaa21d34ad9e972189813bdd5b45107907
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting. The embedded URLs are likely part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607768f1c2c4b---78532485671.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p7aa7nm6nsmuubjq3mjmefjm59/52086997624.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1060a5c5f5---viwuzovamovudamuxapubadi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/13502674189.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8vsnhl8emvfkag6i5qgvs8tjv2/89219625778.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505224936_1421749877.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/t01cj28pk9gsff69v64n5g82l6/75780695791.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/xizikaweriritogesizider.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/k4k25f36nskcp3pn7eipacfcst/fanifugerusasivawufotiso.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/sositerunetop.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6e41af19---81602199373.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/58f2a8a7cc8bb83fb4ffded408252daf/sepigeke.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608842723bbe6---vuwufufijakodewo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2197163897.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/sagf78mkachv9rja9ggg1uuckh/95804084983.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826a133e961---solodetajulanapexi.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/5c4a3abf6148717c59ba532d2c7b3314/kipinigaxalodilolekanuvo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c40d92bd014710c469414d99a2a291cf/90117696767.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/7939719483.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210621_1B2311EC61F837D1.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/85cdfdb22c037aee1b35521c0bf725e7/dejinegokezofede.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1a4698824e6981df0b8574bf875a3a40/xomirumadexetukemu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j638lqnosv9ocvidma8qi09fl0/zubema.pdfIn PDF document text
    • https://master-service.ro/images/file/dapopofomelikaxojeniv.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9d447ebf67fd60ca919a3b5df3539398/51961071656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chill+in+tagalogPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 10016 bytes
SHA-256: 4b2187fcfbd306a709258cd3adc899c6ec7176c57faae18b4fdf75070ff5e21d
font_02_sfnt_off0001384c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384C 17784 bytes
SHA-256: db8e09556067ed0c9d35b74ade87bb2795a978ecbb9880f3c594d386009b7ff6
font_03_sfnt_off0001671b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1671B 9548 bytes
SHA-256: e24b50935027041eeb3aa22bf27336e7262698a54b37de3a85183c21d7f36ef5