Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d545c1d46bef9c…

MALICIOUS

PDF

86.1 KB Created: 2021-07-16 00:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6449e96efa06e94a17ee6695f80db36 SHA-1: dd34a0502391a836a519e2310f657c91d0e29f85 SHA-256: 30d545c1d46bef9cca69a9f357999ada47989de3d46e499d30e673c809d55c07
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phish for credentials. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/pesavixadagokexuxarep.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca95a52cd---fukikisati.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nefimunawok.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/94258879886.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/35874471658.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca8d3dbcb---19785949787.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16084857551b23---kobili.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd397268706---ritisekoforudaburosurosaz.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607624f41464f---tusojeruwudamofatixivur.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2vjqv9r8nicetofqnb3vs4e470/redid.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/915bb480a1862b10aa1bd32f14125fec/zavut.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kufesozibagadaxopuriteli.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ho8f6qtlifo1ics57bm8rv53d6/49921004398.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///21776488600.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/74652678565.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/843vksh50oten7opu3lm1pp6aa/46449561900.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/1a254fc30ddc7dbc60c40717fba7cfb4/kenubaz.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d711513688---77665377394.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3p7e15f6ch4ohvfc0hbr1pfav2/denovakefixuj.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0fc14da778299a440dec4d8da1a8443f/budak.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/m8d0g6bk2hepgaqekl309jnc07/kafubuxipoz.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/92961765622.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/dofelazalotigugamaxile.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/13992402664.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/bafaxupufepil.pdfIn PDF document text
    • http://poorclarescork.ie/images/zugejixejoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=example+of+cover+letter+for+learnershipPDF 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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 16848 bytes
SHA-256: 8b843a2c95fcf8ea7b4e37ba24a293ffc1ac733ab15783baa2f8d30ac279bec3
font_01_sfnt_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 10896 bytes
SHA-256: c95d7e4b4f874e9848b76cb27ed10ce5684a9ce5351073ac22bb2a878bfbc80d
font_02_sfnt_off000132a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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