Malicious PDF — malware analysis report

Static analysis result for SHA-256 36406386d5d766c7…

MALICIOUS

PDF

88.6 KB Created: 2021-08-27 18:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 415c8895963204defe4923749fa42a60 SHA-1: 08903309d9f5737bdb44fc5db8ab72c6dc1d2020 SHA-256: 36406386d5d766c73b9fcbd36e81ca39da24e133b20aec2f3b01ae2dcd215c91
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves leveraging these links to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/uplcv?utm_term=excuse+letter+template PDF link annotation
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/53d568a19175d4d55013114a8a4257b2/foloniliriwamavonibifulo.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/17804941954.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/gajekave.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/pidotowinudo.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/9048921909.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2c089b86---79688109825.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210827182602.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fvgsv0uvu3t65mpvmqukene43d/18743113005.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062803222086.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/73235503819.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/kikemimofuwufefi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4d8d7de93579dcdf2085eaf4935d1489/31032936974.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/95166619719.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/772ff2fbf7fedf800864c745a440d271/bajededawirojipolapulogox.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/52529014866.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b89a2ea01a9---kunabujoporupin.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ntndg1rffb82v79046706546rb/10515221915.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5ef5bf68---3645386084.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/funotabel.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/mobewirakug.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_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 10404 bytes
SHA-256: 2e2c4315745be4c4a3382553e518031ca7169485a69eae8e157b42063af22d9b
font_01_sfnt_off00010c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 18464 bytes
SHA-256: 8d2694a9b40f384b6bf9cc5a02aaae2c47200e85414fa807edc2645b73a60947

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