Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d29e1655ccf2fa9…

MALICIOUS

PDF

83.7 KB Created: 2021-07-21 05:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0aa0045e7f096d89e06392e96cc8ceb2 SHA-1: adb40e5d61470e55bfb6f7d9f63c645e8b898362 SHA-256: 6d29e1655ccf2fa9de618c0b95b133eb06326a7a954c6ad5cb6e94e33a58d5af
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised websites, with one URL directly using an IP address. ClamAV and ML classifiers also flagged it as malicious, specifically as a phishing trojan. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hopkinshigh1961.com/clients/878968/File/56057606140.pdf In PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/biwesigugeragalexipubata.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/194b56373d19045b5945c2f1bcbee43f/wumog.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210622162740.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/7995db9e5664c47496b1d700f5b294cf/96180535424.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2330793e988c472a1e371c7540a2d879/vekatokevomekufurawanakin.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/74321401280.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/24115673341.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7727ebb3---kofiva.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/japij.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/dodajexos.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beecbc57b01---kisuwisojipazosif.pdfPDF link annotation
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8e1d7d562c9e36ea1e668cc9c6cdbf18/13031307913.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2532dd4c---mazitugojotefabije.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/duzagodopikafup.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/diwarenijonetudunevidamil.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732fe18fd8---38795696518.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216181452242139.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/fazowuxagemovovi.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/34065701629.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/wuxal.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/abdb5dd2e1fc9882522e11228395cedb/39537992113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=thank+you+speech+for+farewell+in+schoolPDF 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_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 10832 bytes
SHA-256: 85451cf7e1a8a433aac339fa73e06c3f6cdf23b56920e186e2b2fee49f65773d
font_01_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 16256 bytes
SHA-256: ae1fe7d61563442029292d80a31e22ea6855c4940b6991efee4c6b1931ef4d6d
font_02_sfnt_off0001296a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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