Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3e2ada12a9efea…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 08:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e33ca82b92a8a70ba07f3f924e92752c SHA-1: 1b574d7bff8d7ea5cd6837e6f9744bbfd99b06e1 SHA-256: 2d3e2ada12a9efea1fe86e124fe9c8467388a79fbfa726b600052f0af58733af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised websites. The presence of these links suggests an attempt to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/fatitikibigi.pdf In PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/vukifi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/91025308985.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/dixosonakurag.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/xelodarorobetewowoson.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/48266855273.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_220233.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/legojomikizivuxipimekisop.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/gipifan.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/leretozugin.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/zajuvogife.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b38cf82a260046debefb7f01b628dc5d/67302112875.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/61385161316.pdfIn PDF document text
    • http://esistore.de/userfiles/file/78939359358.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79691169011.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/8876605215.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/89413864168.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613786c29bd85---fikafezuzizetumo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6e4c8592---mirugojujonuzigaxoriwima.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/rekelefaletunigenigasefi.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/49724128929.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/zapajerenujezafoke.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/morozexud.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/kisulo.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/68745576487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=omegle+apk+for+android+free+downloadPDF 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_off0000cfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 10776 bytes
SHA-256: 971ad07116c27e2650c2ba342c22c29251c23e77f12f6e1f644fd75823a0f92f
font_02_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 17652 bytes
SHA-256: 8c9314753af56aec56faceb0df2958adc4a2932049847e0c6c454de44a4d4d15