Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f6dcc01ecaf11a…

MALICIOUS

PDF

148.3 KB Created: 2021-07-02 22:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9efcc8c4008749a759f17c91854ec4a0 SHA-1: 41fbdb98cf9e3f544da3697e0961f7f0fa4c57b0 SHA-256: b3f6dcc01ecaf11a15459e6703adf00ce1ac4fa961bfac8738b699fb229bc624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1d75e2ba---zuxudijubapenosafax.pdf
    • http://akkoryazilim.com/userfiles/file/sexiwutavimetelesanif.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8mvr09ctlrv2oqm89ch065lmg3/ludiraretisamurobukaze.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf47725a9f5---33038280683.pdf
    • http://eotp.info/sites/default/files/fck/file/52669102941.pdf
    • https://terminal.hr/userfiles/file/ziporifixawisijosun.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ced95260bbfdb584ed4d564d4b343dcb/12551484665.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782a4c84e31---zejakiruje.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d8f78326---majedesesamadatifa.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9737bac2---61720681974.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c962b78a311---35431151356.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95b0089a8---19854903361.pdf
    • https://clubkdo.fr/img/pics/files/jodekotoxuzofijudezime.pdf
    • https://obermeyer-modemarkt.de/upload/file/tolerigoporag.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6b590bb82cfebdb689388adac1298abc/sakid.pdf
    • http://bsbcarpet.com/userfiles/file/46933763994.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1fk5iebkj4t9gts0r8o8qnt3hm/wivebafibezitabe.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/65dkfp4drm5jdrjl5ugnuq4hdh/buduxisigetupobo.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/hnfk2otae9ipuknkfn38tv2mpo/69932053127.pdf
    • http://hiredriver.com/uploads/assets/files/19727682790.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608170a8cd1a8---fifiweriwodafosisasu.pdf
    • http://mindatpeace.us/uploads/files/funijulufuxivig.pdf
    • https://stdtekstil.com/upload/ckfinder/files/35266216221.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae64ecd47e---jokusidemosekuxafanobopur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=friends+not+masters+pdf+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c798.bin
b40307322c20b8b9c2d88ac27cd75045a24f1867442ce15681dcccc50c0b0828
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C798 17592 bytes
font_01_sfnt_off0001f594.bin
b3a9c6a82c5ea362ba806da404aec5a4eb3fe92a71777333d26b0acca8e9de5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F594 10720 bytes
font_02_sfnt_off00020e35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x20E35 16792 bytes
font_03_sfnt_off00022646.bin
3a972b64d45857b9317aa5dc314b1c1d2714ceca67425ef977140d1ab6ccc798
pdf-font-stream PDF embedded font (sfnt) at offset 0x22646 17508 bytes