Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7a7de2a925ef40…

MALICIOUS

PDF

76.6 KB Created: 2021-10-09 01:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32ebc112c08ecc693e5f3e11f62709f6 SHA-1: 6f440ee61cae5aa16c4cddf8e5155fd02936a21e SHA-256: 0b7a7de2a925ef405636b9fbd511a8feb07a3cc4f2aac4196cb92988508c9b9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://garglob.ru/uplcv?utm_term=touch+in+english
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161398ced0547a---pemalerekeberenigexog.pdf
    • https://alley.52886.tw/uploads/files/gifujamakevuxozisun.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/koluviv.pdf
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/pozebawumefomibotaxutedid.pdf
    • https://baobiachau.com/luutru/files/16770894449.pdf
    • http://www.abcklima.hu/data/editorfile/xopilusobekopuduxijogu.pdf
    • http://agppi99.pretty-match.com/upload/files/32774107105.pdf
    • http://soles2walk.com/data/file/lofurikekefetikujekexupak.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/872bb5ed1aeea2243b2d77bfcef568f8/87731370346.pdf
    • http://totoquynhhuong.com/upload/files/jurifewoxenexaxorajij.pdf
    • http://toszegisuli.hu/userfiles/file/43666343965.pdf
    • https://esperanzadeavila.com/fotos/file/serejavuvobagekowa.pdf
    • http://abc-tel.ru/data/File/gonidodikararexofoxeneki.pdf
    • http://yacpa.org/yacpafiles/file/vugijidinigulivujarav.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614815a267596---1533284251.pdf
    • https://pezenasenchantee.fr/userfiles/file/lavavapibi.pdf
    • http://anticacarsulaeborzoi.eu/userfiles/files/52959448787.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd717af73---7941953447.pdf
    • http://videocycling.info/files/file/wudit.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210906_021104.pdf
    • http://konferencii.org/web/uploads/assets/file/66205715625.pdf
    • https://misbahelmudii.org/ckfinder/userfiles/files/95572299958.pdf
    • http://lawyergz.net/uploadfile/files/51300358158.pdf
    • http://anapro.com/ckfinder/userfiles/files/89964299350.pdf
    • http://ilksolar.com/Images/Media/files/24163225412.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/kifuloto.pdf
    • 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_off0000c70c.bin
1f0dd958ec054921b48ea76c249afb75d56e05bea4846d259e37110302782fc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 10212 bytes
font_01_sfnt_off0000ddd5.bin
5900847c9092f5874a6ef84cfae4ea311bec7b6b6d0d746d7c318ab473eb59ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 17736 bytes
font_02_sfnt_off00010c84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 16792 bytes