Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ab914ff6d2bd10…

MALICIOUS

PDF

95.5 KB Created: 2021-07-21 23:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f9dafc8e6abbd9021e24f57539d465ee SHA-1: d46e64ece4caad0da53bc7fd2c8696fa7d8e6f4b SHA-256: 99ab914ff6d2bd101b0f78f3f97cda36ac2d7cdc757be971de2702980cf4ab72
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vaness-sens.fr/ckfinder/userfiles/files/tizigesesinirezapezemo.pdf In PDF document text
    • https://bnbcostaverde.it/userfiles/file/50678496343.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf035355b---6691717849.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/vobumidura.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e62e5bdd4---94794951435.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/73417638261.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/24092333471.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/6631157785.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/eka4a8coertbr74n2d61dj297o/17273480543.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/22407947062.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/fdade03caab111832797bb5ba23a1905/10440696606.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/67797742862.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3a068ab973c8e0a4cdcf5e40e5fc9110/75317095036.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acd10aa95c4---97476299374.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/jinizaxalewesi.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/65618130314.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dj40ifkhq4r4iu40ts3j3skmf7/pabov.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160737bff815d7---gorowowonijasedomifu.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/85451619423.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5o9rsqke0l9ck2u0hl2m003es3/99294131084.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/47307144936.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/48391491683.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c49cf1c4---wojevepumap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=chlamydia+after+treatmentPDF 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_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A54 10476 bytes
SHA-256: 85ecd5a3a282b0ab58c8d60a6648ad8bc1d05c15044fca60ea15c65183f03ad8
font_02_sfnt_off000141de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 18096 bytes
SHA-256: 3750b50affab6f4476bdfa0918008bba8da80a8014d96470eb22a6ff9f8c28b7

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