Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a62d78fb7ff9b3…

MALICIOUS

PDF

71.3 KB Created: 2021-10-04 08:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: be5a10f8c99c0d69b846cadb55d3bb13 SHA-1: 85ce031d8b98901dac06c8669faebbb471bfe36b SHA-256: 22a62d78fb7ff9b3e79a18cb96e7ae2383884944bb0d3c519897a7b12e6d7eae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://drivescuolaguida.it/userfiles/files/dinokavokale.pdf In PDF document text
    • http://majorpropertygroup.com/userfiles/files/44895574761.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996df5d99f---31388863192.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a655fba98f---97244470625.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/2396466781.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/nipovasikakoga.pdfIn PDF document text
    • https://arerp.kr/data/file///dasugetagolisatunaze.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/pexojebabumedolise.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/79088479897.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/12357739276.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/57272810540.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/renuteraxekesalesutavud.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/dinipuzo.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/bodisanexudiwonegopureze.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/72314476834.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/puniwa.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/sazarukifowagerasesok.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c29deb32f---xusipiweju.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/62846263171.pdfIn PDF document text
    • http://benly-carson.com/product/files/sowovilefuwatisebu.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/6223214706.pdfIn PDF document text
    • http://garderoba.sk/images/_file/xibutuworomofivufumide.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zidamef.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///papenubiguseta.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/57736245662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+mother+code+carole+stiversPDF 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_off0000b612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB612 10560 bytes
SHA-256: 3fda6ef1b68076a9b7f9b16a23f05a05a8892d2f9c99bbe61b1cb608875ec1fb
font_01_sfnt_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 16584 bytes
SHA-256: 391cc0ad1741ff112492ba2526e2ca4605db996902a08bdebf29a96bbe8fc00b
font_02_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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