Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2adc3489a2d48c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 20:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0564dbc7e81ed028a1ce1d5a288fc6a8 SHA-1: 35760e99626d069358bce78445eab362ca0df780 SHA-256: 1d2adc3489a2d48c1bc08ba1a1d62f16ae3df4d60f68c71dc708d5ad39a233c3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress upload directories. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://trungtamdaykem.vn/Images_upload/files/wukidesakosigigeguvel.pdf In PDF document text
    • http://meimagedance.tw/ufiles/files/valogivebuzazimivafu.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3add7a05ec796477887fea0309a805c1/56750359508.pdfIn PDF document text
    • http://e-sheremet.com/img/46401867534.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/28573334448.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/rajesuzasupofijufanuwu.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/52741272666.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/83713395901.pdfIn PDF document text
    • http://kunbot.com/upload/files/lagepalare.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2b1052e6---81711836164.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/85924080637.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210907/files/20210907131238.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138487b967f7---demejuxoxeluvegugakap.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/gajagerema.pdfIn PDF document text
    • https://seger.cz/userfiles/file/28303352262.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/29495717197.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/85479382144.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4cd7aeababadb7c291e5b3c3c505f770/17898768517.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/54183216127.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/masuwuzorimasej.pdfIn PDF document text
    • https://esz.jp/img/editor/files/83890928909.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/68544140630.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613612a6293cc---44498432526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=after+streaming+english+subtitlesPDF 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_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 17508 bytes
SHA-256: 287b339f5e24e085f58a09e30b3b145cd06158de3fef4b10ba2da6e70a9ee9a9
font_01_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 10760 bytes
SHA-256: 4f0ff8dd7a1e679a3e80770f65c6a62a3e5ee7247ffcd99dad7c75734ca36888

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