Malicious PDF — malware analysis report

Static analysis result for SHA-256 e954fa3a21396839…

MALICIOUS

PDF

86.0 KB Created: 2021-07-15 11:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: badae352dd3060e0a1953288159bc31c SHA-1: 8474296834753ca7fee423f275c0852751d2bcb2 SHA-256: e954fa3a2139683900c67f7dd8c0c05689c21ce8b38ab36de3959eaa1b3b0bb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=shape+with+7+sides+is+called PDF link annotation
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/maide3kf8rhul0192vup1u8g27/potijofexe.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210702055404.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/b5f9a3a34db409fc33826aac5759f218/61886954045.pdfIn PDF document text
    • http://orem.mn/uploads/files/nipudewigobizuxidede.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cc7781cd88ef6e8ca6c930a6bb02226d/siduf.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/13029854093.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/n5lccvie0o87st8d0gn2emhfu3/xalaben.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/151514664.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2ec182bcd3d3d792deb1d759565c651c/42710568267.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/629ea527ae4069726eac9e2bafd320b5/nisamufazalofirob.pdfIn PDF document text
    • http://mp-journal.com/media/file/zosoki.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/23851208345.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/8ov0nii66qbf15kf9f0tvbfr9o/16433376312.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/l5m59f10p6qmloei3npq14lg9k/73082555695.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b8ed9233---majunisodu.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/diwobugalivareg.pdfIn PDF document text
    • https://lemanssrl.it/file/75785456816.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3bf825c289d90497b5f4a14e3b794bb7/39232777536.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210610_2EB9E77C7B62093D.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/14751086066.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ddiv704o1e5pm80qjcl7k5phsj/62925338760.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e0a1ff4e---nefesaxibebodolo.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xulibarukukesonogijoge.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/99731012994.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_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 10496 bytes
SHA-256: 997219d1129337bfc8bbadef15a27af90c9c83b62645690ee6e0fc370ebefdd5
font_01_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 17052 bytes
SHA-256: ee8fc6e407e85f1dbf45ab1ac093d013299c3f84c9e3b8352aca7c1ab1f6b12f
font_02_sfnt_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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