Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a9bdbed57caab7…

MALICIOUS

PDF

96.5 KB Created: 2021-09-06 23:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24299a13221f1ef732c4db26471d24d4 SHA-1: 993f01d34a67d21e0c841716f9431a644c2434e1 SHA-256: f8a9bdbed57caab76c7e70d524868b6ecaab690894c978c784bcb13cd7fb47dc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to distribute phishing content or malware. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=starke+verben+liste+pdf PDF link annotation
    • http://tai-yang.tw/taiyang/upload/file/33711946823.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/61fn7je5370isvrfradn7o03i4/31982509184.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/42418231609.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210726195337_4ojazr.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe86bd452---84687879929.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a56b9624834---xupojux.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160820001bbb68---vaboxigifawunejixexemajav.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19040bf7c---toxikofoni.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/27542485673.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/wibosugobo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119288703b84---sebuvogexo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f5e037ae5---97146417827.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/25120945665.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/zuxonekemun.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/42732540408.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2c6206a8b2ae4ee094521ea87bfe93d9/valejatagopo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/25326722496.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/61628712227.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/manqmoct29fgpedupsf20ti5js/41993192828.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/5631731663.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7acf1764a8omntn5fvsrprklvt/nevirurufunilovogetan.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_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 25136 bytes
SHA-256: 957add6aa1ec3de99793860a8911281fba7d52ab8318c08f68fdd3224e82b6d3
font_01_sfnt_off000143f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F8 10744 bytes
SHA-256: 8101a45d008d5b02d601ddbe6e75df2dd42d9208b4711c7ce7ff7458a690bf40
font_02_sfnt_off00015c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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