Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de95df4871b925f…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 02:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3a97e43464b95ee8c450b31e62107878 SHA-1: 6cfb8d82817f0e24bc1167a61197fdfcdd5bc12b SHA-256: 3de95df4871b925f4595bfe20f59f9dd822e66b4db22935737b38e6c500a78a5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised websites and potentially disposable hosting, suggesting a phishing or SEO manipulation scheme. While no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/15a9e35be49fc84d4e5a23c4e9a988c7/14642201270.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/39922296988.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fad5db1663b02df46acb7eb394711102/95784312414.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/pomofif.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e147684ad5---96508570996.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/96185978832.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/90nbdqnc6kvt6ereo9avs1603e/rinamubizok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e55d9fd6---kujuk.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/29153ee3c91cffa7441e4c94e2460fa1/zojemusikop.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/f8c5roo5113ua3lqprl3ai44e5/85272846006.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/71494411319.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d640f5a80493106feb69e7237e0f2a52/fijoromobewixu.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/22831735423.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd4da10be70---96939830845.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ce4b05a73e---786460972.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850c43c028c---72679374670.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7818c477d---basuzadifexuvino.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/04c9b02cfe2ae20e76ea9592e4ba3832/19660756174.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607feea36e8b2---93929370033.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b74cc36dc---bisiwakalixugukipijafuv.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/apiag1m4jcdrsbd3ron0vh23a8/89287818807.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9048c62f---ruperevavelozufa.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/82220365753.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/48829063848.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071365e4c620---ginekef.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c098e822d3---zovagemorububunezunilosob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+change+rotate+view+in+pdf+and+savePDF 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://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_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 17144 bytes
SHA-256: 011d0181aa3b8f832070d27ce5bffd4058e6c52ca28bcb3732cfd395e091e7e4
font_01_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 10996 bytes
SHA-256: aca66cfdeac1c8b8ac17e01839fa56467f34a4ebe0d7ec9d2063066a87f4b488
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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