Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6fb90a17b4e07b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 08:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3b92d06335e9730f2bbe7c754caa3f1 SHA-1: e8e5fcef05568ea564cf2bcee1559ff5e7685aae SHA-256: 9f6fb90a17b4e07be3fae92b30400e16c3335857a1e7755ffd7ee26d96f294e2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely for SEO manipulation or to distribute further malware. The document body is heavily obfuscated and contains no readable content, suggesting the primary malicious function is achieved through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68e500883---xumexumedusikarar.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/f0ae811b339222da7dfae354a467476d/tizezoxodewi.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/44979865247.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/sawarenoz.pdfIn PDF document text
    • https://ms01bet.net/contents//files/17135979470.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161101158a9900---79522765349.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/sepefianm2m3ib1e11fohjdo2f/folur.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/82478567303.pdfIn PDF document text
    • http://a-pluset.com/userfiles/nepusiti.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5844cb4d479eb9199f6aee1ead8b8728/nixewuxifane.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094d06ea41cc---18697239411.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/sajinoputimetimufapepe.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/dunefikebozu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abfb0425c---vawevi.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/j1uhq9te2vk7s2kfnuh61riq4f/lizosuvumigesezurofumimox.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/83780734667.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/miboxefojakopozexokok.pdfIn PDF document text
    • https://denimder.org/resimler/files/wijeb.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/69395044248.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f283332ccdb---39810879191.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/82803639d6125bb3af446b6586015851/gunoxavoxekijuler.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/tunize.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1360f6f82d---nugakuwotokikomudifogofob.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/56b30636c96b8c38f7f9f41516d70ea7/nugasinefiwasenozim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=color+of+indicators+in+acids+and+basesPDF 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_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 10640 bytes
SHA-256: 629689c893bda5b122eba8e5cd79a2d2a260a544abc28c7e620b78efe50e10cd
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 18636 bytes
SHA-256: 71d3d7134949c117e75d17f044eefbcf3b7931206ef1eb5cc7cd48b25be61868
font_02_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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