Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0dbf75e145b242…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 03:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5f3550fa3b7cbdd59dd8a9d2b1b9d4bf SHA-1: 1e2d349cffc58e344e4596e896ab60f02ed95788 SHA-256: ed0dbf75e145b242d1fac9fa53b1bfc967d6a1e15852074ad3dea42c06820da1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the nature of the links suggests potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://pixomot.ru/uplcv?utm_term=lldpe+recycling+code PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97e8a331aa---linezajodugonatokogar.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1q8rnm3v89o20f8b4emo74lqap/wiwaku.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/6325119836.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/zotokovuletav.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/texudelemaveximatujo.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/zutubotoluretejuwalu.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/67913949883.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93d3f32c0f---1762717142.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a14a4460741d5256bb381151b7b26fdc/kekekilakijo.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051414235973499.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/sonebudolutugol.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/846dfaa3cc1ed0c2c33e407179c4cdec/48699143292.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/kaluzowuvumixaredix.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062718245551.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/16546909104.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0cd9e660e4c4179e5aef1c86d1eb6b37/50913963992.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/51912259861.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/zunap.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/tenirufupunebifufopabe.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d01ae5e6f---sebotewemowegifopafi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/86bc857fbb5a7c0e6a2e0afacf6aa381/97866743435.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f55a200fe5ff45aba57b130d39db9e6f/kaneloriwibitavusuni.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/v5lnrqner407tbumh3rjcqutf5/mibegopinebin.pdfIn PDF document text
    • http://adveotec.com/img/file/xovodobog.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/vereti.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000bcd0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBCD0 19228 bytes
SHA-256: cb0223e1e273eea492326381b4461df631ee9ef85e5446f7cb87d8e285f02496
font_01_sfnt_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 16416 bytes
SHA-256: 11439124293152dd83f8ea53651434fee1c429b3eea0150f6a586095b87b5f02
font_03_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 10332 bytes
SHA-256: 218af5b5442afd2e65445fac4077f02cb6980e37a1e38d27ff3f5c780693cca0

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