Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8520b8442bba4f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 21:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22f64b1eef3c49867b03c9a85f8f298a SHA-1: 76a99438a0885ae059300c0832f0fda87b480bbd SHA-256: 9d8520b8442bba4f1ec478757f06e7d0f080280b52e707a783c5a8289a7beffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=carnivores+ice+age+apk PDF link annotation
    • http://www.icareonline.net.au/ckfinder/icare/files/74990164816.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/72030124091.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/83435763376.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/18157733194.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/32764962598.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/94818345852.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/40148415010.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/43628545582.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/kenowugezonoxadegujeruxi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f411a623f0---36862431326.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/walevojafurinisituf.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/62208660652.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/temijumajusedetububigikar.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/5031261651.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/68076294533.pdfIn PDF document text
    • https://wildnaturetravel.com/File/31548443137.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/70237338565.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324599ae65d---62948906190.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/17965252765.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/finumimepukimeluzivovem.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210904163654.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/dibejuwowumixusasakox.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161313a567a669---11738394574.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/75222421234.pdfIn 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
    • 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_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 20464 bytes
SHA-256: 5d9a81a944280a03b9ed732d0be9fba360c06161389b0bf25b55b7dbbef18782
font_01_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 10592 bytes
SHA-256: 206732049c049644358df51293207d55b6290abae670b8d1f224fe11108a3b49

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