Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83b3ddff0e2afa2…

MALICIOUS

PDF

80.3 KB Created: 2021-10-06 06:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8161e58d98bb65a6ed51b86b33669e3d SHA-1: 2699a4de21fc7d83294d4013f7aad656fb6a4f7e SHA-256: a83b3ddff0e2afa2ea8739d5a4423654b090516d04d80f961c070d9febd51a91
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external PDFs. The links are distributed across compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • 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 http://universalgroupautos.com/files/others/45880693662.pdf
    • http://ambulatorioveterinariovianello.eu/userfiles/files/vepemopigeladasuvevira.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a1800dfb42cb2111ae1517d1a0e303d/linaluxo.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fdcf63212---nazoxitelanador.pdf
    • https://matagujrischool.com/admin/imagetemp1/file/31909396126.pdf
    • https://eletroluz-al.com/_IMG/img_internas/file/wafajenasawadebudumulip.pdf
    • https://tectrongim.com/uploads/file/gixepig.pdf
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/58843001923.pdf
    • https://am-system.eu/ckfinder/userfiles/files/12132865884.pdf
    • http://studiodebiaggi.eu/userfiles/files/81883702124.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5c4e47260057c7515c7b74e5e1abdba/14507018240.pdf
    • https://zebcom.in/userfiles/file/xuxuwopanapujo.pdf
    • http://valosagoskincsesbanya.com/upload/file/bikaporasogiletigamawune.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/02020f6689af4b354624fa34766d552b/45371925938.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/84534362274.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d8e6edc8a---jiwidu.pdf
    • http://mzch.pl/userfiles/file/vewopotijegatikuvuf.pdf
    • http://metall-press.ru/files/bifelu.pdf
    • http://hondaototanan.com/upload/files/52125590790.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc95b7921---24736358199.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210916_235304.pdf
    • http://cardealer-space.com/js/upload/files/6459076395.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/jovawopulaniralakil.pdf
    • http://agnieszkapawlik.com/userfiles/file/zodupatopivowazejuveda.pdf
    • https://asfus.net/virgsurv/userfiles/file/65796453777.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=new+flame+audio+mp3+download
    • 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_off0000d298.bin
3db033359a5da290442c76613f210583009eac995a195cd4d9e242e619b6b9d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 18420 bytes
font_01_sfnt_off000102e2.bin
9e10da58264b50f987be0ebaec9e4b5f9cab9cb076d304ee7ff09585d40e95ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 10628 bytes
font_02_sfnt_off00011b30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 16792 bytes