Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a41c5e0e75f965…

MALICIOUS

PDF

98.1 KB Created: 2021-06-22 16:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b09c7ae55f6e40614d6b6038ec9141ea SHA-1: bf384be03b38d917a06be9e038e206b8e674708d SHA-256: 31a41c5e0e75f96534bc5c4f04ad95aa3b97b6bf589893490aa5246b0c02c71f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no direct instructions. The presence of multiple external links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 https://queure.ru/uplcv?utm_term=heart+will+go+on+mp3+download PDF link annotation
    • http://edwardnugent.com/userfiles/files/nofuxuj.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/97593162935.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/073d0hg8ffekhob82kg5808q86/851681966.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e63d67660---fuxafojijiretak.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/sesazujit.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/2a78c01ff5e8314c3d15edae00b8631d/36219434575.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/87555hnlf8bo9fi7cl6obg40lt/85045561155.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/divejagepaxokafegukalokip.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5543be508---42495550734.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b892b2dc3bc---tuvusekokugejof.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dekajesopamuwojerajat.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160871e55decd5---bilidutibapi.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/84523901249.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608577a1d7fab---58548889722.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2e33812d71a1363a9efaa54227b82f74/sigogesuletojudoboxixowut.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202153012120.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 6588 bytes
SHA-256: 746cda19d0a45b0d6108c63ff8192b2f88c2fff5e5937e692a7cb04b31166607
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 3032 bytes
SHA-256: a809d1a2f761d9f263340a0978c7ca22ff50d6cc7285d631a378f3400fc43736
font_02_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 5104 bytes
SHA-256: 247b72a5d8b934564c08e9f4c9f8badcdc44f4d885882a4a4cc7899681383159
font_03_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 10316 bytes
SHA-256: 23ed806c53c81e8a79cbdab1740f3cb62a1bc6f507cc736fb1de15c4de5b2946
font_04_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 14296 bytes
SHA-256: f0a9f80dc6ff083c6838d89b7a04cf21c3d67dea46f44616557dbeaacef3c85e
font_05_sfnt_off00015611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15611 16148 bytes
SHA-256: 36f0f7c847a3d257bca3513ae5362ff552e89fccc363f2ec096b83b555007b24
font_06_sfnt_off00016b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B20 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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