Malicious PDF — malware analysis report

Static analysis result for SHA-256 889a8b8e7f4115f9…

MALICIOUS

PDF

94.2 KB Created: 2021-06-17 16:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4730835f5736c3e8c0a90dca40132c92 SHA-1: ac97e436118e385d914d7972d1f191dd0965d166 SHA-256: 889a8b8e7f4115f91b510afbff49900676da305ed7076a8b1cca51f24f9eb7a3
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to download further malicious content. No scripts were extracted, but the URL structure and heuristic firings point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749ba59645e---24064515713.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/jezawederofopaje.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4caede34---fadekurisojawo.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/zadanibob.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/biziduxozokopitagasipilen.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/81598437627.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/toguvuviruwasigejiluwa.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608272576185d---684872576.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/66505150854.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5dbc24df51cadb6c51916465262aa0d8/10526212633.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/60775385563.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/83258906091.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609691a926ce4---bijuxopisetolulaxajibap.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/10464cb90d6886413ae236e3e5d15769/zojusegikujobexawex.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/jofiralafo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d4463644---zeniziwazuguminub.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609826312cf65---xatopupanibitofefolob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+the+wifi+of+chromecastPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 5316 bytes
SHA-256: 3c47ed3a160d157a1254e4a0842a4a8f78e1786b103c14d6fd13632144f0b79f
font_01_sfnt_off000143b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B9 11896 bytes
SHA-256: d61a7b14d7ee5b8418ff26a5ba4b366225da2370e05816445ed429d156825549