Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cec718ef65774f…

MALICIOUS

PDF

83.8 KB Created: 2021-08-07 10:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90187845ce60740d6bb38da0f4fe4c3a SHA-1: fbea09b1e60dad8919e62831a6d6760aa5f6b680 SHA-256: a9cec718ef65774f388c226cd783c36065e7aea0468529b82b91e5890ff5dc3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://melz-feu.ru/upload/80709456094.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607c408a70963---fuvidubupegonikibarog.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/xatep.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/mopanamuj.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/67980408935.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d568f81897---6187152860.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/kuwedelematut.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2299dc32b2015927b8878f253048f917/18846216557.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/63384297151.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c803c8a1---zajizizedijimemevomox.pdfIn PDF document text
    • http://signauction.net/userfiles/file/74247421573.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/54097387696.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9760169a3---duluvexat.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092abae4360b---75131166339.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/xexebefoxugoxeti.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba6f6c51a---75680397333.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0d12a8df8---legik.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/nesovafogeginominoze.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/19302502794.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a365370ddab---32061171300.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/97017128133.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/dejoxiwuput.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/61994869870.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/327710bff00ccc1318e26986fc5a2a6d/65981029149.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kukuzataropa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+null+and+alternative+hypothesis+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 11032 bytes
SHA-256: ac2fb7ef667b1bf2a76d229ae1f3e526b5df50e773dfce7238bcefdc5423405a
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 15748 bytes
SHA-256: f7ab86859fab8bfc4264eb3fb09728ec9d48373fc2b083abb35460f3e67a2b1b
font_02_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 17148 bytes
SHA-256: cec7dcd4d0b34d01d06d32745a6a7c0f5b6853ce638ab84cdb93bb442e1fdd6e

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