Malicious PDF — malware analysis report

Static analysis result for SHA-256 108db43ab510bd17…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 07:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b08f60a4b224317ae87dc48748ede574 SHA-1: 6b9c8196732622cd290741dd3222442eb90a758f SHA-256: 108db43ab510bd17b2fc0fd5f2296db00b48da77b0fee4bac36158c2a86c0aad
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external URLs, many of which are hosted on compromised websites or disposable domains, suggesting an attempt to redirect the user to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sportyou.fr/ckfinder/userfiles/files/tesepigasixojejibosiwewo.pdf
    • https://atlas-consulting.ro/fckeditor/fisiere/file/tevavujevasadaruvejijipav.pdf
    • http://abwcoliseum.com/uploads/files/tixusejerotuluwojagu.pdf
    • http://birdwatching.sk/media/file/33313465755.pdf
    • http://www.specemc.ru/upload/files/61515348612.pdf
    • http://studiobaldizzone.com/userfiles/files/54569561055.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/84298157657.pdf
    • https://vroa.pl/chplusfiles/file/34324859884.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/rubuxivudarusit.pdf
    • http://kkagro.com/media/images/upload/file/zopekuwojazepepije.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/15dd07508460a6ff4379704271823abb/48264872792.pdf
    • https://www.lipca.com/ckfinder/userfiles/files/25327052729.pdf
    • http://focalthai.com/file_media/file_image/file/72882194446.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6irh2iksghrjkjtt4c3jaoe056/7752985167.pdf
    • http://mazraeir.com/images/upload/files/sigexi.pdf
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/95674611984.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/53702544902.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/98585138160.pdf
    • http://ultraljud.nu/bild/files/22303398092.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9abbbcd75b5c2f6903ed88e8f0106dd8/84174258211.pdf
    • http://hotelclinton.it/userfiles/files/2688086938.pdf
    • https://sibservis.com/ckfinder/userfiles/files/60964256443.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/ginaruvedafapowob.pdf
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/lekazazitala.pdf
    • https://semot.com/Store/userfiles/file/budonamozobewafevegosorup.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeef711610---sorazarinuwowowenefo.pdf
    • https://reparationmobile.net/userfiles/file/rufixukewi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=justice+league+2017+full+movie+online
    • 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_off0000ea69.bin
bdf0d6f93e17793727047c9d84dec66b42a769af5867953c295045399f296567
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 11080 bytes
font_01_sfnt_off00010471.bin
c288b5928517b1b4383bc8f692ecfaefb1ed2d037dce290978b47eb03a8c4e88
pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 18304 bytes
font_02_sfnt_off0001336d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1336D 16792 bytes