Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5ffa39d3b08f37…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 10:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f4b6bcc5c625cdf1966ab136ff25775 SHA-1: 86ef8e45b571938e3ac4c86388d2aecf985dd025 SHA-256: 1f5ffa39d3b08f372bbf9171564fcf0fe08f4cede7fd0caf5ea0343dfa02e0b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it exploits PDF vulnerabilities or uses embedded JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cokhixnktientien.com/Images_upload/files/90667866988.pdf In PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/0623ed0bf66caa363a849527f4d008f2/loxazexopiwipatudofo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eb124778ca65984d0beeab28f27351ac/lujewo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16124cf0478f85---61691091065.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/99700182933.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/51091362942.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tcrsmcl990dh87t2qh9rpvqu9v/1159072478.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/79638824514.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/36650227870.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/73150960976.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5mncg410t65j8rqr6en7h47c85/55307562126.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/nukinov.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fad58b452---78352701721.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/wuvovewekina.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/buzobig.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/41410108655.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a96bce76a96277b38bc3042fda795d77/81070038408.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/wimijaw.pdfIn PDF document text
    • http://allier-genealogie.org/File:/12188462361.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/navukenibudojozedugu.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/64950272829.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e362dab6aef403f70adaf65092172d78/wuzipuxefevimuw.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/fb3f3d015a91f93a48debefa14fcfb22/91563903980.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/u2cg96tkmv0e4kg8ovaudeofm1/perumoripodo.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/xetawuxozokalimal.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b7b06d3a7b6c56bf82b868041e4678bd/kozutepedifukiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+have+a+cosigner+on+a+car+loanPDF 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_off0000c27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27A 15444 bytes
SHA-256: d5233b71bd79de96ebda428c8b36ebe00bdd5b785f497e379fa5a87fb89d2df7
font_01_sfnt_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 10720 bytes
SHA-256: 1891ea5e5576d4f3aa22ca098050e3042b017bb5b6d9b7dc67ba22c9f95840e3

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