Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca066beb9b31ae2…

MALICIOUS

PDF

73.1 KB Created: 2021-09-02 16:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 946d5018137fa5127cb692a24c25ccc8 SHA-1: 5e10433c0e960188919c72403bb09adf148f6552 SHA-256: 2ca066beb9b31ae2112509fa69bb855af68a0019b057e304ac061f50b54d0e21
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing links through compromised CMS uploads and disposable hosting. The embedded URLs, while many are benign, point to a distribution network designed to lure victims to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/39c3666c88f4a2806a8d133db8ef1624/30948032218.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0905e5b84a---33189594673.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160739a547a36a---76275039418.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f56be70fc0a---xixekinuwujepazeliz.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/zomobolifux.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/86874010401.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611265f95a186---jolosa.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/e81852ddb1baa50cbd68c07bdb7727e3/nolusaj.pdfIn PDF document text
    • http://www.puhito.hu/uploads/koxikagineposakefejemoto.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/gomupivuxifegam.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdefe267c0---18357651679.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/rixuzojudojuxiba.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/69408276185.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lgf7ajhldv3bt2pen2a4bl5gn2/29844304265.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/diwumewazorilimet.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/2417869520.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f1b6367a3---63631797797.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/naravavozogevewijeko.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/kamatusuwoxev.pdfIn PDF document text
    • https://sanidom.pl/img/file/jebavupufomaseteguzo.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/vivupuwulutikulenuner.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c10baeed1fd---71650384863.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/dabiropufomubanewu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078abf81e430---21189144523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cryogenic+engine+working+principle+pdfPDF 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_off0000b8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EC 10688 bytes
SHA-256: 5873dd12e8cc9ac3de950ff1c1eae313dfdce006583c7b180d7af405f40227c7
font_01_sfnt_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 17296 bytes
SHA-256: 61619087268dff0cfd3ab99ef20b36104284be69c268e166a049915053e6852f
font_02_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1