Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c1eb19f5cd1dfb…

MALICIOUS

PDF

89.8 KB Created: 2021-07-14 00:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a079c8c6bd83cdf4fadc5d18cb3aae94 SHA-1: 74d0efac4e9286128a545d74501a25fca226a380 SHA-256: a1c1eb19f5cd1dfbdfbf816bcf3b0f37a098a15a3340def687e46c431cf18289
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea2c5772e---92253422920.pdf In PDF document text
    • http://amon-syotengai.com/userfiles/file/fupesi.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/29306420294.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/i9j8k0h8k3l7mfvjmca5htm404/98199973930.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/df2aec85f8a51caa941825bb08ffbc08/nadububibojabubonakon.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/77847352926.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/41898511169.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/dosof.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ighm1l42pk40a78o0ml2o2jm0i/22651710585.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/gobot.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5cb9c7f6---sosikug.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/46640691217.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/537351765b2f97754c5976293ec77a1e/surezeboliwagelipu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/45407175009.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/44426135593.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b979bcca326eb0b1b894727be55c719b/wixiruwakejajatikig.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/711d8c0cf4eb0eb07163e7ec66ca94c2/86151827241.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/80683410433.pdfIn PDF document text
    • http://aweibel.com/Photo/file/45601049055.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3lmnsn174a4p2bcd9hltcp743e/wobulowudube.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d0895040a---kabezezasetigoxune.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609048a283500---wixekizegikozumimomopama.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/18918975205.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/62159860063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=words+that+are+spelled+the+same+but+sound+differentPDF 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_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 18876 bytes
SHA-256: 8a44cf413dd9368be44530ff736c97a34f4b29d6b056a879516963a519dc5d26
font_01_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 10996 bytes
SHA-256: 3c7ba1297b48f34e94e4493d3ce265dfd176dd6645658a150294b19c47140863
font_02_sfnt_off00013fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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