Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7dacc74a8a077c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-14 20:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1de026769ae4026fe777e6b165185730 SHA-1: aff983f1d43882dedb9f48ff32da0d9fa962e296 SHA-256: 1f7dacc74a8a077c6df3eda2491c25901c993664afdf327da24521352f369e41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=bookworm+adventures+2+free+download+full+version+for+windows+7 PDF link annotation
    • http://usagimatur.com/files/others/zudanavivojaja.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/66588457726.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/bupakagomoju.pdfIn PDF document text
    • http://industra.sk/userfiles/file/nubomemopenijes.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/27287763623.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/416ebd2728791351401bb04e7e5ebf35/86409718804.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609285a5caefc---79636625752.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tizikezufudoresabureko.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d4ad267793d3da6e2d375da23dc7869e/8018402584.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/41980951551.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/73440461209.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/qg5bovv4u4i8g9aohhq6adei0i/50010570470.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/muvukuda.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/96408057983.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102ce11266da---xavidixatojeru.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/nopazarobevim.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aecf91db9b---bojosemule.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b3e78911---77652767631.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210628091732.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/jukajewugigaxuki.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f7855d934169300899283b782927aa24/58518009254.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/63676071865.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/a4bu3campapmi7p7ums4rdl96n/vopelax.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/39dda83c0feb9e510e8d0d56dbe5a8d1/53434240211.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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16328 bytes
SHA-256: 3cbdda319f2878c00e765d3e5c20b6023e96031f33ef5c46122dcc5053ff2c69
font_01_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 11080 bytes
SHA-256: 8f0a560c88dd6310b517103656c743f5c92224dd4c293489002e8690b78a5f2b
font_02_sfnt_off000132de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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