Malicious PDF — malware analysis report

Static analysis result for SHA-256 0656bdcc43757e83…

MALICIOUS

PDF

94.1 KB Created: 2021-07-17 23:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 92fd7258171a2d53fd31fb39bf27092b SHA-1: d4ddab6f674fb89ed38ac6a37571d0fd05e441d2 SHA-256: 0656bdcc43757e838962ae2218ae548c173528dec26238f35de5b7b6bc88b9a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document used as an initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/faa1986c6dbe41b2d2f31428cc67edba/fijonobiz.pdf In PDF document text
    • http://geo-equipe.it/userfiles/files/ximonepagabufogitesoven.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/63032918890.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932dd501151---tovopojul.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c728c409fde---juxajiduwifed.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/t38ti3p7c92avp1lbhi8s6ehfl/27468073543.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a4c49b6a---polidagizi.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/37924946348.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8f216196818a86b6cc39b7ad96151468/64062173296.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609412118d3fd---57279991867.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7l6pq8mdgua7l04c5tfmbf4os7/88939529814.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/tubusop.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/498706dc06f32e2b0b9d353c7233909e/xodaromefodavibuburapab.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e344c4c96---nogokozeduwuninefad.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/14517157374.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/42414670291.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759256661c7---13783360202.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/lovufoxepasuvesikesebije.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/26209366430.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8255e61b---12680075263.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/21cd9e9c470bee6ce27f998f8a4b60d2/30857739109.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/xusipemunotegolomigo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095450959c3c---nozavunolurazano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=apps+to+download+tv+shows+for+freePDF 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_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 10636 bytes
SHA-256: 21f55905a2cf3f61f999cb38a913e06591cc1a3653f3a5128cd5f3898badb6a5
font_01_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 17988 bytes
SHA-256: 4adb403140d8a66c24bf68ec16b9295d73bdb67b002c69407a975bc1a558f2a8
font_02_sfnt_off0001513d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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