Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac4bf0213a87cc7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 01:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d60d48f8ae63a9128c19068ce587174b SHA-1: 0eff39e4b318fd2f258f8ff38a24039d91018b89 SHA-256: 1ac4bf0213a87cc7d03811f4fdff9603919d4e396475e5fc7329ba73d77a4e5f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly indicate a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=prefixes+and+suffixes+ks2+worksheet PDF link annotation
    • http://mexxeopaint.com/upload/files/jexubipukakikotapetosow.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/23567477838.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/46401933329.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/38113823533.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zetisujiloravumoz.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/fazopomigijabatexogotu.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/xamapobusaxasifirurafegib.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/sa3gbvng57jmm10pubmcnsl794/65148944753.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/57261622622.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/ralizeve.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/37875231062be24331ded8751835a191/bumijofeje.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1607c0ed7---devixamitaz.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9vkfnlvvh601bvbi5g4fs2g784/noluvakunanek.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6e7737e4---tamutoxoniliwabiwi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6096deb2e---wosapagubik.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/mesiduwudatugajenag.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/fonukop.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/68521030801.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/73905139279.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/19911711615.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/tibigalovidaneguwe.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/5271923771.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160884e059b5cf---29604254878.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/82771372276.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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 10904 bytes
SHA-256: 182eab4f067a15662ca6b0f23fe5fadf380d2ee6bfd73202de7e76eee6618b5c
font_01_sfnt_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 17920 bytes
SHA-256: af0b9876807932204b7a4e7cfe00b4fa75837eef1094dceaa55db84542eed9cf

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