Malicious PDF — malware analysis report

Static analysis result for SHA-256 9574c1250049b4f2…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 14:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ce638658c335a56a6d5bfb8a5f2f7b9 SHA-1: 825a8179bdb85d1ca45e49e2ccfa52911b8f26ce SHA-256: 9574c1250049b4f2c200ca39421eec76126be8bc29ac50f5b0b1c28b923705c1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting sites. The embedded URLs and the document's structure suggest an attempt to direct users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://careerroots.net/ckfinder/userfiles/files/80851605727.pdf In PDF document text
    • http://dkstores.gr/userfiles/file/36080975800.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zopomew.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/39300898434.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vijubofaz.pdfIn PDF document text
    • http://edituj.cz/res/file/ditegoditubizax.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/85572994298.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/puzifizefatavupesabisixud.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f3e0fc7235030edfb2580bb37d8124c9/70038975859.pdfIn PDF document text
    • http://standardamulet.com/files/files/57450676622.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/35771306797.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/70091857382.pdfIn PDF document text
    • https://stvorki.ru/files/file/41664069593.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/11699187251.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/17433322999.pdfIn PDF document text
    • http://intertribo.sk/files/44261027967.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130453d3c0cb---zumemutolonedofewexutowe.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/dalegu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e28dba174---kufubiv.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/15157336580.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/49345397471.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210901220926949502styvoi979gy6.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/97832572649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+app+screen+resolutionPDF 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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10588 bytes
SHA-256: 3979d3adbff87f582805f1663b833d840cfb1c619ff8977af958d8407cb9d8ad
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 17276 bytes
SHA-256: 73ad2013f4bd6fa5fe61cc2604257e8120b99a926a723dff2896e4641367bc1c
font_02_sfnt_off00013225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1