Malicious PDF — malware analysis report

Static analysis result for SHA-256 686ecaf5718a4a1f…

MALICIOUS

PDF

97.3 KB Created: 2021-07-02 14:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b605a4528efabe77ac03c7fc0025c2e SHA-1: 8d984d46f8968c942730c5a2e17460c1f462f2e0 SHA-256: 686ecaf5718a4a1fff1b513dd253a2d0c524afd7c0c6061167d7698528585e7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb1cd1dc9---63961438588.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ddad200444f---97792814505.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/6041b96965d15139d1622e60a35f6062/visewuzuxixaka.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/fivojilizixas.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/566e0b0f5a87d91ee1fcfcf118f83f41/fiziporud.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/48ocdfd8igcn5trd9sc9potc6g/12347898361.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/kazezesofuserakaruki.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a875e572c0c---7294892161.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab4be732c---93168851782.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/82149007589.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/14b82a4e8b8a616457a9a63fdcaf7ad4/69272104352.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a872a656426---wotuzek.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5d247ec434f5b0b6acf64855a9b9827d/76880876512.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6342b4b982---xolut.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/firowazifaterizokozuwijo.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/caf77a5969b7646aa9c9e4be319fb7dc/gofejirebodebiwowavol.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/voxibazuxomalow.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160947911b6e0e---jomix.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kipazaserizalos.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06e79d2e3---pabumonusukapezubasup.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/626a43a2f65065e2769b6b41da78ef0d/luxumogijogafinikexip.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/79749518080.pdfIn PDF document text
    • http://hodori247.com/uploads/files/tepiku.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/65908460581.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/798sotang5nkfusk69sq6pj5c9/satotagezijojavotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+reference+manual+of+pediatric+dentistry+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_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 17472 bytes
SHA-256: 4fa1a5a97305fba2ccfff8d6ae3080042b1869da8f225ee7472b9c2a789c90b9
font_01_sfnt_off000145fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FD 11064 bytes
SHA-256: f4542f4ae8749d5fa5f8511d7b2332bcae6b89c11cd48d970f3ce6b6978c4ac1
font_02_sfnt_off00015f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1