Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e8159ce266851…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 20:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c24e1c32187eb0119315d72c122f8028 SHA-1: beb23b70770422f00eed233611c936e86e36d115 SHA-256: f52e8159ce2668511a54cc4022f065d5bdbc21fb07e13ddd44afcd2f197a8445
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a full-page image designed to trick users into clicking a link, which directs them to a compromised WordPress site hosting other malicious PDFs. The document body is heavily obfuscated, preventing detailed analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6ee0daa666e748c22dbb9b67b3e745a8/zabatepesok.pdf In PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/88984928366.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f0e26e7468ba8c6f1328547ff9b8e199/70066525814.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/dewejulajojije.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/99328814687.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/budatetiwuronekive.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/xuwiwagukawirutifez.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/40252278918.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/kojivikuvilazafo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/67a8be57fa4ef5288ba6a6ea1ffc84eb/magalizegoxubazam.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/bojesobowifosakogudixixib.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/nopomud.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613feaba9b9bc---18001355719.pdfIn PDF document text
    • http://iviltra.lt/images/files/xurapoketabo.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/66651613731.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/kuwelomowawovadokutebinow.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_536EA0CA3B5BDEB7.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jekataxilakoziduxa.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/tesesebinid.pdfIn PDF document text
    • https://jagominum.com/contents/files/fidirikozuwedakebo.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/lajunomumusuputotofo.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/2625458822.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/vilopafabuxam.pdfIn PDF document text
    • http://vollaracis.com/UserFiles/file/jobem.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/nozejaxidep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=frank+herbert+dune+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_off0000b067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB067 14212 bytes
SHA-256: f5cc4f0c541fda86ed9aa1d9a59e10d27e713bb48767a0b4de65f6f22fc05fd8
font_01_sfnt_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 10476 bytes
SHA-256: 531f78367a347663ced3ef955a41a4aa54f6a66c2035f4bad24e9ec16f21534f
font_02_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.