Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fc9163505b3d6d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 23:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76102ee52f6d506373a2cbc5e0b2c8d8 SHA-1: b10ffd3f4237ecab075d5ccce2ed753fdd6a193e SHA-256: 12fc9163505b3d6de9bece22989075b9f4d068561cc331f7f63a64d17badbdb5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to other PDF files, many hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://tubelessons.net/cms_images/file/18253037607.pdf In PDF document text
    • https://mentormedya.com/files/rovavodo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/79639150153.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/xowejupubolef.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/vajirumupelaz.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210907151641.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/rezemimirezulu.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/32071548731.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/vesonelirib.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/40299496933.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/81867279133.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/kifusideserisojudibe.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/fezotilegawerixiwatuguv.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/75635152051.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gb8t5ngjkqcsdmkb4pae0j4l4m/23012038095.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/fc7et0s4t20584o4i3ivlqmama/wosusugowajinusedi.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/65814330023.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/34809634502.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/bogigajonolagoju.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/vovuwo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161384952658f3---bexugu.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/bisirevesibexafodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=moto+g+recovery+mode+not+workingPDF 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_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 17252 bytes
SHA-256: a994e265d58036fc1a10ad5a2095cac95dbbb4ff600db0a8bc53e80760acff96
font_02_sfnt_off00013500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13500 10688 bytes
SHA-256: 6cdd868b12c17b0b506ae675d2a91101cadb882bb83410ceb74db4530f9591c1