Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3785191691d469…

MALICIOUS

PDF

76.1 KB Created: 2021-09-24 06:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c39c26b9377f0a719cbb5bb29b91a0a7 SHA-1: c3aedb3787e0789794988498e1c0349c0432872c SHA-256: 9b3785191691d4692d32398351338c1b1120736711b5eb7c0257d5dee710221f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The file's structure and embedded links indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://smalternatywa.pl/media/upload/files/77b761d4a81f88f34fcf9ff7ab76587b.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d4ac9c4f5343417e8c9c9124b826d4d9/76478654583.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/lewobitopa.pdfIn PDF document text
    • http://edallyshop.com/upload/files/86574912440.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614972024551b---fawedi.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/76824590962.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/taxuwepoxibalepuke.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/70915466351.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/zelesibaloram.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/loparaxu.pdfIn PDF document text
    • http://nessium.net/userfiles/file/40674595963.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/8024654864.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614370d418f8c---torod.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/308852ef31a43a8f0e8866d4f3fb1ee2/3068785517.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911316447484.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9fceecee3---mukonelatajixatatavagiti.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/zimiviwawadax.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/27423534444.pdfIn PDF document text
    • https://eurotig.ro/file/sumodotip.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xitidek.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/73710506844.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/70932861348.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/nanevikuxuwukapi.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/9113050993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=area+51+iptv+channels+listPDF 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_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 10584 bytes
SHA-256: 274f9cb9a397548b7b805a309bf9ef73e106a268ff9893871802fba1abc00096
font_01_sfnt_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 16968 bytes
SHA-256: e261fcd7f19ef53524eecbedb9f448133ed407b8ed63c301bb57cddc7e758af9