Malicious PDF — malware analysis report

Static analysis result for SHA-256 56328af324fd992e…

MALICIOUS

PDF

82.8 KB Created: 2021-08-22 04:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b923b92eef59bc2a34a5bc6f69c2e44d SHA-1: 6084acb1d457f40b781a020f27d22e971d5f2717 SHA-256: 56328af324fd992ec93827a5bc7ab1ccb056ff1825a9ec29a2a6eee8004f975f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm and a potential phishing lure, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The embedded URLs, particularly those pointing to compromised CMS uploads and disposable hosting, suggest an attempt to redirect users to malicious content. While no scripts were directly extracted, the nature of the heuristics and the detection name strongly imply a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://nyirfa.hu/uploads/files/bitikudopodawopubi.pdf In PDF document text
    • http://effekt-film.de/files/file/73425488922.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/34381874526.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63d14befe---vukabevobiguloninonago.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/tuxedulajegitujido.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/23613008586.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160f6909051de2---dipejedesapugobezogabego.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121a38070c92---nazagebateved.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a36c34a2f---88178791595.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160759e6bd737f---disoxup.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071702500073499.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/da4cb5993fd8cd8cf8a006203504c625/vevuxitegipi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210621215651005.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cffecdeff---pimonujozosalage.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bce42f75b---dafowewarekuforimemo.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/kedapoxu.pdfIn PDF document text
    • https://norservis.info/files/files/31324793193.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/24728721277.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/kidagumukazerugedado.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/da693933b3ab0b84b521ae242fbf6fd1/55416858499.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/viwiliwi.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/sazekodobazosabi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o8pf2a4775sjoatgsmbvokcrho/90657880335.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/93176218663.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7kqbv4sgi1ful4lb00vf3pokl3/zowadu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/kamuwijakutipemeperawoli.pdfIn PDF document text
    • http://www.fotoliIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=photoshop+cs3+dll+crackPDF 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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 10548 bytes
SHA-256: 063f202576e54d2b0d0400a868749b4ea15bce9927f3e2feb8c751988b85f778
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 17284 bytes
SHA-256: daacfa6ce3aa89c9110e615aeccc26f9f98c002e22ec1a0a424ff57dca24ff6e