Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d424803fef73b0…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 00:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffc539b51a87f6ad7f273e52ec1e430a SHA-1: 8ffa1e4d453356235f9b906fef77bf70694ca2cb SHA-256: 71d424803fef73b08088166357fbb66b8ad88522b973a89b9d988be3220ada17
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, distributing links across numerous domains, many of which are hosted on compromised WordPress sites or appear to be disposable. These links likely lead to further stages of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9800b9f841---goxidakuvowinal.pdf
    • http://blbr365.com/userfiles/file/1624980824.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/408139bc32100cceb9c5f20b9d8f7e7b/xemexivovuvalazuzazag.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c09f827a933---tevobanikawepesesurogo.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/85318581488.pdf
    • http://seibyou-koujien.com/files/files/dofolizofaxavamunim.pdf
    • http://anhbanglaw.com/userfiles/file/61689286856.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zozefegelolenerotelor.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0e5prjhfqh4hl8jgar8h8p78q0/21810061209.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d857b543839---7959452363.pdf
    • http://gtlmarinefuel.com/userfiles/file/18390234944.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608651d3cf6d6---bugojiwaname.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/47600a1f54bea6ee650bfc31d4be3bcf/89118995013.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608871487f230---98480966838.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f7f3507f93e63f9604fb247370d21d6b/73755488226.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/57664e78c65f3bc305042a008a92f25b/ruxewasiwojamazonaso.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/11013347744.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607148c70fc4e---gawurupejib.pdf
    • http://novichiha.ru/pic/file/34551744387.pdf
    • https://preprodpcb.com/userfiles/files/44511320894.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/7e3b81d97d4dd22ef25647028af35acc/65550834245.pdf
    • https://tsafar.ir/basefile/tsafarir/files/91117707213.pdf
    • http://fandimnarodaku.cz/upload/file/89249727725.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080655852964---dozotusumezeto.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/dcd7ca2944000194f8fe7f7862f8d089/88230254783.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4cb9dad93d6fac4a21877e6334cbcf55/83407886194.pdf
    • https://habrit.tw/ckfinder/userfiles/files/27985624284.pdf
    • http://zuche0551.com/upload/file/34696738622.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=life+expectancy+of+a+green+cheek+conure
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 16792 bytes
font_01_sfnt_off000113ac.bin
cb70a4cb374624def18787df8ecc0b1f353281adef04d5228a35859c54455228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 10908 bytes
font_02_sfnt_off00012cf2.bin
9adf3ed9a3d26ffee65b1d721ba04e4d1abad68492f24efaed590509cecaa430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF2 16776 bytes

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