Malicious PDF — malware analysis report

Static analysis result for SHA-256 d776a4e06032b27a…

MALICIOUS

PDF

130.1 KB Created: 2021-06-26 09:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 89d7c2627685a4407d0d6074b2529742 SHA-1: 493ddecea2feef6ce88978786219f2399b6d2296 SHA-256: d776a4e06032b27a81e645a47d115bda2aca021c715c9376d27dec96439b045b
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808af634137---71739659440.pdf PDF link annotation
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/26272540491.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ddccb158b64a0af75a39c54f4ea03a58/27473112612.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeef4e83ce---nipavubekusefuz.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rosasebuwosusofuwetit.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/fuzududeka.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/taviborigimagolawive.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/i6ni5m7g8696lvigbgeriljtf3/83325141364.pdfIn PDF document text
    • http://sun-tes.ru/files/file/senanubimogoro.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44a60b689---4632706978.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/18274633569.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/c9edgvth1m2tgugp3l2ag8al1u/mapevivepolofirolisisizek.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/47484034225.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aa88583f5d3c1e665ac33416a1b04843/56600299125.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae621ea2dba---lujilig.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b545be0ce1---67438594668.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/donudorevipugutumifuxew.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5ac055b2---nanotefov.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a871c0d826f---metim.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a913753e9---jufeguf.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/futcssk0f6b6dgftpaa14lmq8d/60932102408.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4256b59c56---23938327786.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4454dd0e---32778650463.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/38012018785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=valence+bond+theory+was+given+byPDF 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_off00015e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6B 11024 bytes
SHA-256: fb620180097fb46ec0714bfb1e1e71c4728cd8d441cfd17ded87f5698bf12930
font_01_sfnt_off000177e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FF4 20808 bytes
SHA-256: 06d2e047589e3bbec2e70d1a162b5a640679beb4def7a1fe735b4c1f411ba328
font_03_sfnt_off0001c4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4BF 18036 bytes
SHA-256: 21f4f22557e629715546ecab8f96c79b0149e7c3a8724b03a93d74bec3058fb5