Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0321c6eeacc6758…

MALICIOUS

PDF

106.2 KB Created: 2021-09-20 17:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d532b2012a42188f30898d3c606a1911 SHA-1: 4d81d7b48af4ba29f147fbe23c12aec0c27d71cf SHA-256: a0321c6eeacc67582a9d15e0d38639bd650eac1259e60824c894de809bd171df
196 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. The presence of a 'Password-protected archive lure' heuristic suggests the document is designed to trick users into believing they need a password to open an archive, which is a common tactic for delivering malware. Numerous URLs were extracted, many pointing to compromised CMS upload directories, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=urduja+village+caloocan+city+zip+code PDF link annotation
    • https://sunnyvale.com/wysiwygfiles/file/81069005513.pdfIn PDF document text
    • https://nevisnews.com/userfiles/domovi.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/10458615440.pdfIn PDF document text
    • http://online-cycling.com/files/file/fajigodewogulolupew.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/rofamikekozofivekilewepag.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/92359e343a7efd6430d1fbc9e9685d31/fezetozisolofurixebojul.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vju19e48v1s8r1rbt1ueg98n7g/dekod.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/45770579023.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/42345448131.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/83785758891.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/59010606328.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/40e5804010e039148933bda7338bcf15/nikazorusuge.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/mujarejitilawonedara.pdfIn PDF document text
    • https://beautydent.hu/editor_up/49300580279.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/50299104276.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/85562989365.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/13896368113.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f7ab49fd---saximazixezexalevapef.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zisanozig.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/953298309.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/mofebotapujapekuxa.pdfIn PDF document text
    • 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_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 11000 bytes
SHA-256: 55f7f02968f0533fea9b21a915f0a25389de5cece762683718ea91c79edc8636
font_01_sfnt_off00014dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAB 20468 bytes
SHA-256: 966f480e069a996e0cea27d7ea713b7407847816c742568e3644588a7a31076a
font_02_sfnt_off00018322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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