Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c79b7d80ea5f807…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 12:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d68710f4b0ae9b87a6dbb56ae892b2f SHA-1: 884a11a44fd74b5435a58a2b13aabbf2a3bca9df SHA-256: 7c79b7d80ea5f8078bf642036bc5ba22d22af96d322da823ac5519cff347a48d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a link farm and the nature of the URLs suggest an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://thefertilizergranulators.com/d/files/64808653836.pdf In PDF document text
    • https://tvsporedi.si/vsebina/1428635376.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612d01d9ec064---pugulejaganugunajikele.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/57019594682.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/nikenupitopobavuwov.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/51593954515.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/59759100017.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160db49de75fc7---9768180838.pdfIn PDF document text
    • http://art-ball.net/files/file/gogupizotamemigukulakeb.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9be126cc---duxoxa.pdfIn PDF document text
    • https://rcot.org/userfiles/file/sijowolixasolawaxalimus.pdfIn PDF document text
    • http://fotossc.pl/_files/file/78887151913.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/228p2snvlgppmfd1gciqnik0at/taxusoxepaka.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8cbaef72d783929dd5cf97f2a51df591/44050693022.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/dakikeleg.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vdq32rdp60hl3tbmdjlkn0f6q6/rovivixadunefesodabis.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f7f534a54efb6365b1b89f1995bdbff5/30931482221.pdfIn PDF document text
    • https://csn-alliance.com/data/files/tiguwilotenusawiruwidibun.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///68105816672.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/94935552562.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/76bd793f60bddf973c6f4748fd5c08b7/tagelusodubunud.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/teriwasulivuxuzowev.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c3d7cb2f56fef9d03b07c2e9b6d7da5b/8787936668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=smoking+truth+or+dare+worksheet+answer+keyPDF 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_off0000bf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF98 17000 bytes
SHA-256: 05b012612a0a9e11d5dc15c4a7f33d93bf974e665e34ec5c10cde8bed9bfa6cb
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 11116 bytes
SHA-256: 92bac7d8ba072ec0f6b1802f02baca0fd8e157341c288d96e2004c3c8f0e7f16