Malicious PDF — malware analysis report

Static analysis result for SHA-256 3183e917aa1bfd38…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 12:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a7d4b4a8cbe49d72ec799bae8cf478d SHA-1: 0395e2aa8ad5047733b09d5b3ee3d4a983df7330 SHA-256: 3183e917aa1bfd3898b5cc5f2a970d6a882096fa02091df37dd8b02ac74484f6
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and link farms indicates a broad distribution or evasion strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://decom.pro/admin/ckfinder/userfiles/files/tubesegokafitidopobu.pdf In PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/90901895584.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/18967560626.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6298e7c2---63941701893.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/59f4e466b56a0027e0f78b7cd4b8dac3/76313565836.pdfIn PDF document text
    • https://greenways.at/userfiles/file/44722721552.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/9513563219.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21ece491a---87529520489.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ddcd8bfe---xupuvapavupikedurunoge.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/70891824465.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608935ef7a64e---lekino.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/gixafazawowawas.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3ef6ed156a06784e6513a7a9638f7d20/jidiwaxerokove.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/beguwomozulitexutolevutig.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/40506186007.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tegelo.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/87218940317.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784a62665c2---66751338388.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/85855121828.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/70e6074d2783a0d535bf739d27cedca0/63503641145.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/18280264611.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160903b21496bb---79417624764.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1626147419913158783.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mhh8a7p5lp2hqavfmihoe6aloi/45703224809.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/jedix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=release+form+pdf+downloadPDF 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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 18044 bytes
SHA-256: 31f30dbe291bc2d61bb5ae23e28aec3370298190b07f36c3a0e4432f4c3d8c8c
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 10600 bytes
SHA-256: a4c89ef41d45f0202a9ab0c349a1a5da60bc74fdda99f272380ab1aadd304a17