Malicious PDF — malware analysis report

Static analysis result for SHA-256 966360b4de2054af…

MALICIOUS

PDF

76.7 KB Created: 2021-10-08 10:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3acbbcca9fa77b885ad148f529be925b SHA-1: 6f1ccac3ac681c223ffe6ff8022470a44eac57b4 SHA-256: 966360b4de2054af40af2d23affd65626cc86852446726df873255710fcba765
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external links, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript (T1059.007) and the nature of the links indicate a phishing or malware distribution campaign, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=sickle+cell+disease+is+an+example+of PDF link annotation
    • http://inarchengineering.it/userfiles/files/funurawatuno.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab58d81fab---95524022566.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79c329b6f---xupewomebegoju.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/jakamalopovo.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/zopawibu.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/puwiwuneg.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/33513489904.pdfIn PDF document text
    • http://favourtec.com/attachment/file/34522546756.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/85442019932.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/romugepeputapadinokakuri.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/54282803103.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/86716426936.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/zulivowefivuludaxasawekub.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6da96cb11d9aa047399b786db3a9e738/sununajezeden.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/5141512616.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/57534000213.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/wijodil.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/34732974512.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/sunofukesufupigasab.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/39882096039.pdfIn PDF document text
    • https://toocapen.com/files/soneg.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/23978618433.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/19029864132.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobimefiripolakagutiwa.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_off0000c5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 10852 bytes
SHA-256: 15082d2040a502bb728132f10330f6cb8ab59bcf01dfa7cc090d48eacfacebaf
font_02_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 18156 bytes
SHA-256: c154722bc842ae57c49e8b737a5614147de16e284d279e8da287c775b5aa3ec0

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