Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf0229aef31015d…

MALICIOUS

PDF

78.3 KB Created: 2021-08-29 05:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 130cbb7fb683edf12002d0f50a90aafc SHA-1: 7579a5b659bb3786fc56ff3b5b0dfc336160e900 SHA-256: 1bf0229aef31015d0b9c2fc285a2af1effeebc6a44fe846da8d828eb6626636d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress uploads and disposable hosting. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/julozaluwoluxenuvot.pdf In PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/21211125801.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/jbv6uhdh9usid718oem3tktjp3/romudodawekexevotupemaxaz.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/xefipibasukal.pdfIn PDF document text
    • http://quaint-house.com/12980548463.pdfIn PDF document text
    • http://93564497.com/userfiles/bakidazipudodaxupezutawag.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/jumopixofa.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/33575884342.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/96390415142.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/27885966950.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/zinibura.pdfIn PDF document text
    • http://skomi.ru/img/files/file/bebozirejuxeluvemuri.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb917a95d---51125051202.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/81962985123.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/93209594857.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/44482513114.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847c7d886a---kexajabipirulopad.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/56854114574.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/rujuregidufemis.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/virutenefumale.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/6341290598.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2a597f7fd---nusoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=patrice+lovely+familyPDF 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_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 10404 bytes
SHA-256: ca65874c062194f4576750c00658abb7f66f87ef6981de226e9a1e42ac3451aa
font_01_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 17276 bytes
SHA-256: 3f3289a1314c4119dc1d1a3a043c4e2022c9f89284e413f6c3046408f1935cb0
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1