Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d6a0da3d2f2771…

MALICIOUS

PDF

88.8 KB Created: 2021-07-10 04:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6fb41677565f8481c772b9a4cb2841c4 SHA-1: 1cd46d3720b14c660d9a947869e9b0dfebbc4ab9 SHA-256: a4d6a0da3d2f2771e6cb3a46161128c917bd29f3c58c0a46e82d162c3059d77d
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, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate the primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6de0ef304f0171e055a31c06b605a99a/58624615092.pdf In PDF document text
    • http://massageindex.nl/images/uploads/29116089043.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9c300a81d455c9428d48fbb9052aecd8/60198155663.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/79870982027.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608120cb85afb---bajodukemujanakonupepusi.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/puloxuloraxezupujil.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607493205c196---ligevesaxoza.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/34165303540.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/lurejovavugojepeg.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/wuwakomored.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/sagibonukotal.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5f276550---24730203789.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///92313133323.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/dubogetefo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ab9b62776---zugudoxodejewatixeturiru.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/03f87b97148395a899d3577ddb664455/78180351797.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/74682078134.pdfIn PDF document text
    • http://splogservice.ru/content/file/pafedoxev.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/85853211374.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/gusewuzuzewewovavop.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/lisivefojufabubipebij.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/fepabexeriv.pdfIn PDF document text
    • http://isgsrl.it/images/file/43466431217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=american+horror+story+afterbirthPDF 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_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 17696 bytes
SHA-256: 9dda8cdcd8c6edfc25fa801dba28165f1bffff2c75819df22d2418fc8fb0a78d
font_01_sfnt_off000123bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD2 10788 bytes
SHA-256: 89978a8e403da214a7fa1d220254c2abacf699d9d80bf35f5f0a4f4c2a16ce23

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