Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d42079c5431a65…

MALICIOUS

PDF

83.0 KB Created: 2021-07-16 03:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17dbf1a5d8cbdbcf155ba5d5b8d5cf04 SHA-1: 725d466325e8255c45e1bd1c1c2ebb8d46e4b008 SHA-256: 38d42079c5431a656311094b41d003cfd011e8923aae9455f013375cb905ed3d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload storage or are structured as a link farm on disposable hosting. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of it being used for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/91780384119.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/dobisovaduwolireweni.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/levg9in2dp32jps1dal30r9ih3/guwikabina.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/65420bb2853cb79468f88c2b82e999df/fonadufoguso.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/07a4a5be7cb94c693da13f51fb30c22c/novijozilasupudefusife.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/ruvoboxalilip.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b50896778---gufuk.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/40970228151.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/pamateguku.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/wovaxavinivobifivijisoj.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/b6t51j7rgu8352tl7gs8hrop86/30677185921.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/92680892973.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/63292368747.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e72f016ea9---sanetunimutinarubuwowoxuw.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/37683359817.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/gipokidaboxatelaravivizut.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4bfd6a2c---24379967370.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876ad66959c---66970198790.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/18502211108.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/nebarebef.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/rukomabetugitafibopoz.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b56b1dd40a4ed1386ba67d2a762e7c7e/nurirujezob.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/dezotulipomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sphincters+of+the+gi+tractPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5e5f8359958464c3f4731c6b1c7577f8/tidagitolik.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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 10788 bytes
SHA-256: e890abfab0e31db2ca451065d622b1463d566626f693005e5b167c4d9156ea5a
font_02_sfnt_off00011611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11611 15808 bytes
SHA-256: 55a4d994a2e750db02cd6514593afc2ed102830bcbdd34f4209983911c5cc5b6

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