Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4600021f1038fe…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 07:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 093c5afa0bfeffe7c66163248bd3a272 SHA-1: bf7b14d3c9d4968042224110ef49c7370c13a78c SHA-256: 1e4600021f1038fea67a323967c9ca37d05afca045fcf8d756c2eeccaabbfc23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, hosting numerous PDF files on compromised WordPress sites, likely to distribute further malware or phishing content. The embedded URLs and the nature of the heuristics suggest an attempt to leverage SEO or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b652721b---giponijopomud.pdf In PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/84662522331.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/776ee002609a3dd3180258a4fd05b3a3/4888537872.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e793abccb---pekejojago.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086be3b6a120---27214233554.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gc234pulmcbnsa62iekfaco0af/bukuwoletinijigojatewere.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/67554822730.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2da9489f1cb5c6a3c68ee297f3a768fe/46727532881.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/dujisulugagagota.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/28496438156.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/nivogute.pdfIn PDF document text
    • http://artospace.com/pics/file/54480614354.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072153feb597---40832453779.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e78028b494e0874770684854a2a31160/4804081274.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607224c0ed170---tavaf.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/dumesugepexifudabalatas.pdfIn PDF document text
    • http://glearningsolutions.com/userfiles/files/589746075.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/6072526218.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ai7974n5pin5osn002tp5m1nh1/notidofufelutolebewo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087545b5e4c6---zoviladoxeteleximiz.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/cb0927045a93bc8bc118efba06774ebe/78057429143.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/voluxadudosezu.pdfIn PDF document text
    • https://akvaguru.hu/user/file/vajubabibimuxejotuwifef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=yield+strength+and+tensile+strength+pdfPDF 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_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 17892 bytes
SHA-256: 15e7f83e573f8e809d582062454907d23ef365a762cd7c55625a27031b704b10
font_01_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10640 bytes
SHA-256: a9efe4ff09392ad1a818c803bf2df9b8783e1f2413967e0ab60895bf056d35fa
font_02_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1