Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd673b5a14b413c9…

MALICIOUS

PDF

93.9 KB Created: 2021-09-18 15:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e49befe5050ea2858c6c16b887b1fb74 SHA-1: 0f96b7ca2b856a6d43c9fd2e0b164448e36af113 SHA-256: dd673b5a14b413c915adc8d18209b6ec35dc88aada194b03bf88c2013caa7dcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, directing users to download files from various domains. The presence of external URI heuristics and the compromised CMS upload link heuristic suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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 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 https://synerhu.ru/uplcv?utm_term=download+game+ppsspp+ps2 PDF link annotation
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/wowosenazapexuzavogisexet.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/19258156385.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/dulafuveza.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///xesil.pdfIn PDF document text
    • http://villkasz.hu/editor_up/zafade.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/69146935804.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/68438723578.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448220a936b---77812159010.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/q1q28ldb9vsvuesp7ai1s4hoh6/17493039014.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614334df9c2b0---jojulijawu.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/lofuxaluduwodedirelijeb.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/85e61c65d46d2dbca3a5d87ca32c3ffe/rinibutebemuvubuwesa.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7619f2a0---36737564200.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/fedukax.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/fadowetoxewoxa.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/kajeleruxojalipevudewuxun.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/53548970152.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/noketaluxedag.pdfIn PDF document text
    • http://opersan.com/file/lokivexujupewameso.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/fanomevezuxovod.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/63876272823.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613babcd6af6e---rexeki.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/mosodefuwurixixipajidol.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/41495436184.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/mesibupekazetediripeboke.pdfIn PDF document text
    • 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_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 10652 bytes
SHA-256: 8c756b26478e8aa2ee629d927e02849570eea4a1b26766d1803916d21705c98a
font_01_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 18128 bytes
SHA-256: cf0cb0e68a7fd04fffd365356f8ac5e0a486cf9a451fc6d9249c585682b2dfc7
font_02_sfnt_off000151cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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