Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b556073b9c19ba…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 07:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d884c83e6bbfa8030edc87f5cee9003d SHA-1: fd7634a7ce87973b18b61fff64a012b602b29688 SHA-256: e3b556073b9c19badeb04d5021943c829292fef6c15921bc91d8897a769925bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://zaiger.ru/img/file/vosamomafatinix.pdf In PDF document text
    • http://apcmagon.com/userfiles/95674613030.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/davulutorabujitax.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/jekobesifavomamad.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/4035397512.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/90040318536.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/46688000853.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e956b4294e---12041779434.pdfIn PDF document text
    • http://fittbikese.hu/files/file/tedowajumojexupi.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/paronotomuz.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60095728294.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/sumupa.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/2848485305.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161391a8944442---banokibesi.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/vizefatotiges.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136fb6fa3c47---fubodesikoxitezutinoneza.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98984336561.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/37457258235.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomeduku.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/49112825178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mortal+kombat+mobile+ios+hackPDF 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_off0000c720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC720 10616 bytes
SHA-256: e49832c18a0d1332940dedfc8ae76347042db0dcee3f752e7be49af3a24770e1
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 17140 bytes
SHA-256: f35e5bdda72f6825be20124af34d93c3939fc0785ba739ab811f98fd9f503250
font_02_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1