Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcde5098c82003b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 03:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90ee83fce06232bb2730f8b5a9ba1222 SHA-1: 614b4eafd4f3bf3284e51e1cf9ece6682cca82fd SHA-256: 8dcde5098c82003bec075bf2406d81e599b07c5993c009f3c98f44070be449a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=agile+construction+project+management+pdf PDF link annotation
    • http://africa-emergence2019.com/userfiles/file/kinabogokepazulewofapiruj.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ab310dd0---86897970385.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/fonaduto.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/tojedanuroxilakapujiropi.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/59511733839.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa1b91184---wozujewaram.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/70603441630.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10d98d23e---81645716940.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/gofakosip.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076de978c7e4---sefugakovegesipowubozas.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b60c5e891482aed3b25391f131f0fbd4/8236976873.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089740eee50c---46628931222.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6c47065a1bffa14066dff7ad334617f0/49425527014.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/69868292717.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/62453583323.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/51648141569.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905f11c069---bolajugumi.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/55562734934.pdfIn PDF document text
    • https://5uempat.com/contents/files/18048605612.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a5f44f7ceabe6864e356efc1bd73d2/54469244688.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b2b832bfcba556462e97df5bbfbc2263/mipalodojin.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/rutanizerobosibizubet.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/77257115998.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/nf294utn9vd9rii2pkgeuppgst/23730587542.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/61728732942.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/54704090223.pdfIn PDF document text
    • 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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 11176 bytes
SHA-256: 20c1709b96485d9b06fe52bb77f8db63569dc7a50c2462be4d56cf4c1ea46d1d
font_02_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 18076 bytes
SHA-256: e7f6b5743bd056f4ac3babbf0786da3d0414deab4ee48347a25b3069469a36e9

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