Malicious PDF — malware analysis report

Static analysis result for SHA-256 daba091efe3f8b61…

MALICIOUS

PDF

93.4 KB Created: 2021-09-18 10:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b99f1a6a4012f8578ebe082f56984c93 SHA-1: ab7674a939ba70871064b6e3974f7c77b097ce4b SHA-256: daba091efe3f8b619c30f8fb3a08efbbfb07d4e88a6da0856cfbab7fee464aca
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://irlanc.ru/uplcv?utm_term=can+i+make+a+video+my+lock+screen PDF link annotation
    • http://nzozkrowodrza.pl/uploads/editor/file/pewowi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/07555317a142b0913c324d5991a29bc7/89529177824.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/64934002411.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/gogukuruwejapelalatanawi.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/zixifezo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/33687357686.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/071730079872.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/51328665101.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/bowawidesuzubad.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/nogatudokivisipepiwovaz.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/lovabulukudunu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141667d6c4f2---25906347939.pdfIn PDF document text
    • http://secoinblock.com/upload/files/bupopowadelavi.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/59822342244.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/videzuje.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/91202270115.pdfIn PDF document text
    • http://debten.net/UserFiles/File/57118945843.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/95261565364.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/zelavadaw.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e84d7a92e---28005769804.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614052d94f695---ponovixeguzuvezoj.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/resokigaworani.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109171650479695.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/puminavaxafukafokegilu.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_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10736 bytes
SHA-256: 7a808d7b12383f6010f2b0b0db90c0e3d9100afc87023f3b739214e1b1a7ddc6
font_01_sfnt_off000122d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D3 17512 bytes
SHA-256: 2de5c1eb92fcd3bbaf3e04eebe40df3efec42683172604fa40501c07d7e32f0c
font_02_sfnt_off00014fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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