Malicious PDF — malware analysis report

Static analysis result for SHA-256 2084cf06fd305ff5…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 09:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e29b67fa30da426c88d1424f3b62b6b4 SHA-1: 412470e3c0c8e667694f0f834d3388af50ec947e SHA-256: 2084cf06fd305ff51b53f60b299c7fd457b2d115c5ac050adca47ef43a4976b4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, several of which point to compromised websites or are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF's structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cambresisemploi.fr/ckfinder/userfiles/files/80795396725.pdf In PDF document text
    • http://netart.hu/userfiles/file/21889904592.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/fogubisuwisim.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ea4ed77a9a7c096f2b3d94a24a4c8664/98508851142.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138422cee662---fabunuji.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/legiw.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/sakolaboluzadisa.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/67896292794.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/varizixotulubipoka.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341dc88f4e0---wowiruxuburadopumuteniso.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/jitajusoxadaxivaxom.pdfIn PDF document text
    • http://nemalipics.com/21714219419.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/kufarut.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/kagexuganuvinixuti.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac3831cbf---geperatisojavosojuj.pdfIn PDF document text
    • http://bjjiffy.com/upload/4676983367.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/wuwasobonitobe.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/12171039178.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/84716672527.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/zulivajina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=among+us+free+pets+downloadPDF 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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 10916 bytes
SHA-256: bb3faaeb3fc4e376d0801de1959a6cdad1c27a150321ef597c22d2a604c07a01
font_02_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 17896 bytes
SHA-256: 35e1b7b13a837a2381a6a4d34807245cfdb2fe2432f19cce15b5bf7e5f18d6c6