Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d8f8e97349393d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 05:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 962f8f601142c7bff7502d6e520af24a SHA-1: 43699b66b84d7f6ac5c85bef463f3c5b81dbd907 SHA-256: c3d8f8e97349393dd5c19cb4fc42aa5fa805f6c64e478f543f907b28b9a1373a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=spider+man+far+from+home+full+movie+123movie PDF link annotation
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff18199cda---rodalibukelekumorarid.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5atduns4cpghjj0nhs27hdh4a4/puvijojopodaxarebuzine.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614134b9c0d52---xanukasakarav.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161412b695441d---75709630192.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/29295138903.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/gigudifu.pdfIn PDF document text
    • https://csodamalom.hu/files/files/someroteretor.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/2407880308.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/suvetirezatoze.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/41747183349.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/rajisogizosopinulisamofu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/lj35ioqt1aps9k56446v34po5f/32853498835.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/91143076952.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/52788626403.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7a099103f7204c003edc11bfa5e7ce2/42795060933.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161328ff30af8b---goxetiminuwogos.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/35640595070.pdfIn PDF document text
    • http://araratmebel.ru/img/file/95252520593.pdfIn PDF document text
    • https://premiersuli.hu/files/files/12578469.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/64849c39fee08253fc8f1abd55f3ae7f/97330081978.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/pesanazevaxe.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/31096282584.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 17272 bytes
SHA-256: 78dc2c48663c65680bc08a25b30f963f5766d040c391a3d9bbcc24f515bdaa44
font_02_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 11084 bytes
SHA-256: bfe6cc5c5416fdbaa787b47837ca5bc36379542be7ecc8c5b56c978e538e5b8c

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