Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd377badcc705d38…

MALICIOUS

PDF

81.0 KB Created: 2021-10-06 16:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 726dd394bcff2f92f3ee598f08617c07 SHA-1: ce225eb9240131b076fdab1f0d9884841de0d91e SHA-256: dd377badcc705d385496736ce3739c056f420d36f56b7604feb2989c2b381c93
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised CMS upload storage, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The presence of numerous links with 'utm_term' parameters indicates a potential SEO-based lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/52075582036.pdf In PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/15578867715.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/rajunitegor.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/be928121f9a37ba087846e338499f6a4/buzubol.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/23025604022.pdfIn PDF document text
    • http://recrute.fr/files/files/kejuzizari.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/83127506834.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/lazojenox.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/weditaxuvavekigike.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615d4e3939fb0---kofajilodebes.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210919_AA0503A9263A24A4.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/49225331726.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/47531364655.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/83331739607.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/basivagolurufusaxuxiw.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/62108924590.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8483ade2b---49466131765.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/58744567357.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614212552b034---vomozivizezitawe.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/zewemimonugonel.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/10361568682.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/buvetotirono.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/23168792084.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/kijirogutej.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/visamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=plow+the+back+40PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 17088 bytes
SHA-256: 7cc099fbff159bef3e36d6cc8379ccf8a54c8ed7707a55c2bb5c957c72c5f6ce
font_02_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 10380 bytes
SHA-256: 6451c144e7f3d015514bd32d817e351eff3b073c26f01da11c330c9c58c6d97a
font_03_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 18228 bytes
SHA-256: d2912151f72bdce9fc3a93bbce21253024712af620a208e2f557d8c946e6675b

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