Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb644be59391ab7b…

MALICIOUS

PDF

75.9 KB Created: 2021-06-24 17:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5e61c207328ef48db49194ff4c415f01 SHA-1: 755add47bb3956953ecb27f424554b40b908eef6 SHA-256: fb644be59391ab7b3b1cd10affa48080b901c3dd2c8606f5c82829e15ba126e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=how+to+insert+letterhead+in+pdf PDF link annotation
    • http://usateatop.com/_upload/files/93848494902.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/xuzudepojikuritalu.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/61865964382.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/21869200624.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/89896054740.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/tizasojekotexirimesixuros.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd317e9cf3---60313179848.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/29315815349.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/88468994348.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/79738199576.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/83346369493.pdfIn PDF document text
    • https://combrooncom.com/contents//files/keganol.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/vupifidonigigusufe.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0bb511865d51af821c83049b0e391e9b/13271114358.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/oejs9c5k3p8jceo2c92q4mmm97/pitaseg.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bbe49764cf0e9fafede11ef5f5d9e5fa/dufosisefupu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e590a222c---88848917801.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 5180 bytes
SHA-256: 16d7ea11958e457a16958cbf0b1529dee21a00d4d70387d558d4fed8510d1ff4
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 11180 bytes
SHA-256: cf653ad31d12eee19bdc5444e6168d2b86001bc701cfedb1d43c45e0ad99f43f

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