Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2e7347eb775623…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 09:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af9eb8f23afc6891de5f9b06a36d3219 SHA-1: 00ebf9e6e152cb8999c2ea33303149fdd1fcae75 SHA-256: 1b2e7347eb775623a4dc84e7c513ba23e43a01ae917ac65f42d7aab78cd7a9c5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. These links likely lead to phishing sites or further malicious content, consistent with a credential harvesting or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=essential+principles+of+physics+pdf PDF link annotation
    • http://mawaevents.com/uploads/file/fivig.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/gaduxisaju.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/22298170405.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/61256301642.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/dokidebunesigajutek.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/nusekaxirupazevaso.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/megijimefap.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda6f810d4---18774188121.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/22842614272.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/18509438722.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/8046543955.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r7q06k3u05jjmn2ge3dk9e11u3/71615753769.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/rawiwinejimugi.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/wezoxano.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/be9f6e92f65c2b767b5844650c14cf11/rofagerinirugazajadotexo.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/davevirek.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b834d4d631da7e93c1bc640c0c21ccef/72680935818.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/vifirobalanek.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631474329.pdfIn PDF document text
    • http://schokozentrale.de/idata/91797688034.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/pufetititikefi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7001274ic6fbs1agjm2v4l4g93/61444422773.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/fizipulixepuvadovakivor.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/28581285632.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_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 18080 bytes
SHA-256: 6e249fb0643988d9b775635135ad569529114eb8000cb2bc2c7a91e9d03112e1
font_02_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 10816 bytes
SHA-256: dff489a7f0e14a4e9f2a6e04dd8d828de75af8cd9ad26945c981cbf2c5432724