Malicious PDF — malware analysis report

Static analysis result for SHA-256 5803a8751a376997…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 10:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2939b64d14e44ae29d102b7277362e1 SHA-1: 14656aa0ee8602689502ae6a291942dc6d8cf408 SHA-256: 5803a8751a3769974141591338f5b3594a4019999062182cec25c8a148abc4f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which point to compromised WordPress installations and disposable hosting. These links likely serve as a distribution mechanism for further malicious content, such as other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 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.
  • 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.gpkoaee.ru/ckfinder/userfiles/files/zabokob.pdf In PDF document text
    • http://www.tokyomagic.jp/images/library/File/ziferitigafodokizoxafona.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161261d5580c2d---91651271939.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/xawuvapimogo.pdfIn PDF document text
    • http://jaht.com/userfiles/file/95936027231.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8de9dd268476fcda510d0dfed85e17c4/wonezegesetos.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/28750880007.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7e87b311---sojipejugumizelarun.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/vomumejudilojokekajaviwuj.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16072f601cc13a---wefazepenaxawuvonewa.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/zoxesarogikejovumejadoj.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/42023226540.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/sifirebos.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b8b613d6bb1b48a11d79444de7a67c53/xugirofeb.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/74676870206.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/sdetb53qqpjqialjkid83k2i77/kifopigapimutinowamal.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f504b9236c---ropafezakasuzetaluzigon.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a6367d867b44e95aa466f33362db3d2e/gunifepusodujun.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/relokixazewixaxo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bv7hd3sd8hkj1hc2tjrs0qlbr6/35876209626.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/59278544676.pdfIn PDF document text
    • http://medi-sen.com/files/files/tagamutofet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=never+being+satisfiedPDF 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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 10544 bytes
SHA-256: c2297ebe07bc0032451c71466f999de867fe66d87b64efd21cc5d37d0adc9c8a
font_02_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 18188 bytes
SHA-256: 9dbd40eb85d216b8032d75ef72990f0a6979dd8dbca4b673dbd265ffb5ac6ba7

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