Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b20498ea6718262…

MALICIOUS

PDF

66.9 KB Created: 2021-09-27 07:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd2bba74901cb02d82ddc98dae46f862 SHA-1: ab7a6c0e3002c03fcccc8850130ac567bd40e882 SHA-256: 4b20498ea6718262f0a7b155abd2fe55ca887fb78063f900ea7cd419d043581c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF employs an image-only lure, a common tactic for phishing or malware distribution, as indicated by the 'PDF_IMAGE_LURE' heuristic. Numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://alhambra.kopanramen.com/uploads/files/16123570606.pdf In PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/65834170206.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/84527552969.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/67345797246.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/pegerafir.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/junise.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/pikefeguz.pdfIn PDF document text
    • https://highrise.pl/file/welezurakewugupezodew.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2742ff7286eba1c67825bb7fd3e96406/sorofutuxu.pdfIn PDF document text
    • http://benly-carson.com/product/files/59630750059.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/50620685424.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/dokoju.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210923022755322.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/jumifidarek.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0d812f13---33596624013.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/83545185026.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3a65897f26a61f5425ad7081643db8f9/29264898567.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/39927767237.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/jilomazuwibovewap.pdfIn PDF document text
    • https://mackbeks.com/files/file/wetunawanuvamuwebalibi.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/menitikukikirawuwemed.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/82278968253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+town+movie+torrentPDF 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_off0000ac39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44B 14720 bytes
SHA-256: ffb365a6501d764bdb89badeb2a2225bdf8e44d7592dbfaa35980b5ea3e7ff35
font_02_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 10112 bytes
SHA-256: 3a4f16a14f0ada5706816021d765ec3035f6f3576203db187aee90cd25100fcf

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