Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd04b23395e40f75…

MALICIOUS

PDF

76.8 KB Created: 2021-09-30 13:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3f4044e3782da56e65e384ffd89d2d1 SHA-1: 61e51fdef46d9a75e6dbaf4dedc87d91a44727f3 SHA-256: bd04b23395e40f753b2e54e40e3234080b644f57901f2c3d2be488edfa994428
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to external URLs. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user. The link farm, hosted on various domains including compromised WordPress sites, suggests an attempt to obscure the final destination and potentially phish users or deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://media-get.ru/userfiles/files/11339643987.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3e0cdd00---lojaz.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/33539602980.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/lodopuwawutuzonawoxiduf.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b154cb19b---xepekonebepagele.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/kumak.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/voparafenurerox.pdfIn PDF document text
    • http://calisnt.com/uploads/files/9525969831.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/32354787016.pdfIn PDF document text
    • https://huanghecables.com/d/files/kekixozizimix.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/48106094653.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/89821622136.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/rixafogulitugipuzo.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/5083961715.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210930094303.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/nupagawo.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/fuxexodujetimikekozan.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/vorigenoguvedef.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/9268993356.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613333bbcf52c---70654741348.pdfIn PDF document text
    • http://congress.bpv.su/content/files/files/fijojom.pdfIn PDF document text
    • http://markone-tools.com/upload/files/11400604235.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109020721103729.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/2568670842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=face+swap+live+4.0PDF 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_off0000c4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 18632 bytes
SHA-256: 3ea5de235b0270308e81c5c7097f46d0a0c595bb9edb9bf5a057c7ddba146a08
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 10340 bytes
SHA-256: ce23a44af22af7887be7ce12dbda1c0ad188d025183ffe8822ac7f05a1676222