Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a15e68b52093887…

MALICIOUS

PDF

76.8 KB Created: 2021-08-17 22:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2db6749b76a2854b672afce7f7e716f SHA-1: 1f597435e31595242dffa3e95c957f82253455a0 SHA-256: 7a15e68b52093887c04e488e629617905c1a4540de88883876fa6766f57ef136
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF files hosted on various domains indicates a coordinated effort to host and distribute the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bititechnika.com/uploads/file/jasewodigubitujuso.pdf In PDF document text
    • http://www.sudaff.com/pics/file/bikibotejebono.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/46946006940.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b03f1132---7976861597.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0cfdc0bf---doxofex.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/lekowezanaburazebuk.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd57cc2f2---62432680740.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/46779329286.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/bakutubijutaxevisurepuva.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/zasise.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jslth3gfuf2ajtm8d84epkvf5b/pemibudopozaganupo.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/38150594411.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b620543191cebca72c0eff1ff7fded36/lutagezipasorezapona.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fuxup.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/7632940532.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/23835929705.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/xifakurexenirepelumofivev.pdfIn PDF document text
    • http://limoride.net/gallery/file/suzaferifenukote.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb80a2212---95685523956.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/ripejikutubezirepikofo.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/wujibolofetusabozunubew.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qhoaaevghobp7ir2mfmmau8pk6/50044844822.pdfIn PDF document text
    • http://hzqzg.com/d/files/febuzumeri.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6f38d9196d6d8a9111b9156ca6d0a4f0/94301870421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+lagu+koes+plus+olala+mp3PDF 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_off0000c6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 16976 bytes
SHA-256: fec4979f53ac6c95e6ceba31eb0366732ef7fc6ce7e7d02184367fd20c57ad20
font_02_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 10896 bytes
SHA-256: dc64ac6e1bbb5b4e47370efff55837832d269ffca31c57da5933dcd47922a4a4