Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58b3d554c9526ff…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 08:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0db38e6e1b475e533f1042a121589bf8 SHA-1: e89e2bf57e9dcfe139b096f8d31092cbb2fce449 SHA-256: d58b3d554c9526ff0cb5d2e89f965fd15a47b56c5f9b1e8185caca1aabf13b9c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://rajakeempat.com/contents//files/rupejebotixaxetigijon.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/bavevejizedapiran.pdf
    • http://www.gesas.it/media/mailinglist/file/bagaxopami.pdf
    • https://syntellect.ru/Repository/file/43545796713.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a819f6c148a---43761689822.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c09c3e828e8---39327860915.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/68746251976.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7e054bc9e43ef83ae31d2a24103a741e/lenilosamoxipowazaratav.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/48577453526.pdf
    • https://bselink.com/userfiles/file/lenasudozebovubolifij.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/54cc008556a77052a72a0de027f97487/50245948585.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9ef480668b8bfad41db4a8eff360e42/depokirutanisate.pdf
    • http://3bbb.fr/ckeditor/upload/files/jusazafomuxoxipigenowed.pdf
    • http://duda-tech.pl/dudatech/upload/file/dakizagulajij.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608603f986dcd---muzinaxuroge.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a6c2df23ace---varapewojaf.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bf84bda53486ab41356fd30b422a71ac/kilomo.pdf
    • http://itkaufmann.com/images/fckimages/file/56279224671.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c639bd0dc3f---talexizot.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7a7d44b13f83133d0e29a2fd74500abb/wimemapujijujozabeluxaf.pdf
    • http://pijntherapie.be/uploads/files/kekajugezuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=phase+10+official+rules
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f777.bin
6e0252b448c2edf3c96038a7e183d58fcdd54709136ddd2b9036d9f0ed9b1fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 10508 bytes
font_01_sfnt_off00010f8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 16792 bytes
font_02_sfnt_off0001279f.bin
378344764c969f7873db620766cfc3848bf2521c650d77330382ca1726d8a3dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 16408 bytes