PDF malware analysis — malicious · 842c3404acfb8d18

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 11:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 98b073ba12cc81e8c05af217c8f87e54 SHA-1: 49c20a70c02787b68edd7a82d608d5b205ca879d SHA-256: 842c3404acfb8d18fd99fc6a6791c8ed270fa9c20078045203bfff46c76ea6a2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host these deceptive links.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 https://laborke.ru/uplcv?utm_term=oxford+3000+words+pdf+free+download PDF link annotation
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ec637ab96ebed23e584ce73fa16e0cdd/pimezibosodalezigi.pdfIn PDF document text
- http://yaeram.com/userData/board/file/bawijetabefakutoze.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6b822c68f3a43e2fa1f8fc8cdb81c0eb/12444350970.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161301a807cba8---gedejefudosufo.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba7d22035---63728759643.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba450f1c3---gubokezekenujedajot.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ea9e6d8aa802ccc22a676feeac87cdf4/lepobodoxilipesiguzof.pdfIn PDF document text
- http://kuzfarm.ru/images/file/43795795220.pdfIn PDF document text
- http://hydrem.ru/images/file/28830311427.pdfIn PDF document text
- http://nutrizionisti.eu/public/thread/risorse/file/30186591993.pdfIn PDF document text
- http://wagnerpc.com/userfiles/files/75514968029.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ef4956c197b778cbcc13a85a69828e06/vodiwobaw.pdfIn PDF document text
- https://hagakure.by/upload/editor/files/32041457608.pdfIn PDF document text
- http://nuraski.pl/wsg/userfiles/nikojudovojifekopodite.pdfIn PDF document text
- http://flyingcarpetclementines.com/userfiles/files/galufurosaw.pdfIn PDF document text
- http://alhouti.com/userfiles/file/7364742471.pdfIn PDF document text
- https://isosklo.cz./uploads/93704744356.pdfIn PDF document text
- http://www.aamuhsv-madisonalumni.org/files/files/wifavexoru.pdfIn PDF document text
- https://kclandscapes.com/ckfinder/triplebuserfiles/file/zasinosipilupogunatu.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/rv0644btuavvaumes7sspst4hp/60510426785.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757cd6d746d---29540184745.pdfIn PDF document text
- https://matfplayer.com/calisma2/files/uploads/wixeziviguwowedev.pdfIn PDF document text
- http://geoplan.su/userfiles/file/81794670527.pdfIn PDF document text
- http://drairtools.com/ckfinder/userfiles/files/24652124929.pdfIn PDF document text
- http://www.alexgis.com/siteuploads/editorimg/file/lokadepowupobaxofeze.pdfIn PDF document text
- https://feltshoe.com/userfiles/file/kamexiwojibotetal.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d7fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7FE	17624 bytes
SHA-256: `ad0bab6b6ee2e5d3ff92529e4ca495fd5842f86890083b7730284b3e223a0b4a`
`font_01_sfnt_off00010630.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10630	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011e47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E47	10808 bytes
SHA-256: `c6e531cb10302bf72b9c74c168dcd0cf2ef60afe27e0f2178356c3619907e822`

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