Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94e542616d035ff…

MALICIOUS

PDF

169.4 KB Created: 2021-09-04 01:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8806b97488b97cacd4979185badcbaf SHA-1: 111c07575471ba25f630b71e0f97dd68ea52037e SHA-256: f94e542616d035ff0f0eb76ebf764cb3f3ab48182032f90c764b30058ac7a661
236 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it's a link farm and attempts social engineering by luring the user into executing commands via copy-pasting, consistent with ClickFix attacks. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9d9514b55454b278d47237acd3e06eb/ketojamoram.pdf In PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8806cfd97---17509264875.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210513070117.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/37832634578.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/53292206700.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/2b9763bfbe883c8cfcf1e6e9f96b5154/wogaridoji.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g5itj0eqck2u9lqr8fgkun7r44/ginefutijoza.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/xuledegubim.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81e0079ffb44cb9e64d3a84141134baf/sowobu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772846464c8---76614012910.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/96134839463.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/08a7cf6bf1ca9f0fa09276e95c2649b6/91523339307.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/81231159698.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5569b062---76516968202.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c8c00a30---12433610581.pdfIn PDF document text
    • http://teifsepahan.com/files/file/zaninadudugeguzomineto.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/8f05b41398debcfc09b47419c70f06dd/16247954908.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/11633831987.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/26982001179.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7432b3a9c008ccefe32fd82fd8fd4e6a/98479723493.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/83786092079.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/fatusorizov.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/topuxebugadosavivo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160901ab325058---kedanekuwez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=manual+de+uso+silhouette+cameo+3PDF 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_off00022cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CB4 22576 bytes
SHA-256: d338656243733f738d30bbe14dcb949062d1f0b817f814005410b5283be3724b
font_01_sfnt_off000266d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266D0 10800 bytes
SHA-256: 815613193cfe3d6df15f4d92e74227fd62d8cc2b3fb7bf48c758709aa5e5da99
font_02_sfnt_off00027f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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