Malicious PDF — malware analysis report

Static analysis result for SHA-256 947a168ef43d1bbc…

MALICIOUS

PDF

76.0 KB Created: 2021-06-15 09:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: caac9dab33b405d055c751c95b0fbe53 SHA-1: db40f73f32f3724373860d1e7ad3ff729bd50a64 SHA-256: 947a168ef43d1bbc37a13350c2e8ea240ca97173b3b61f0337df08ffc7b88219
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm hosted on compromised WordPress sites, with URLs suggesting a lure for downloading content like 'new mp3 ringtone song download'. The presence of multiple external URIs and the nature of the hosting indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://chcial.ru/uplcv?utm_term=new+mp3+ringtone+song+download PDF link annotation
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfc742c29---lewivofikoparuto.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/075ef9942662e07b7a20062229be0064/dugevo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160901c598fd98---jixatulixuxufixudinevim.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3cba6e2ecd6d094c05e0042ca550ac51/kusetowapogejozizutukefol.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zonovedowalekitezivoso.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf4b1d97a24b60ce76fc9e40e9d85f62/xivuwedutamumufeletagezov.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/zebeniwulerunogala.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/lp57c2056mlsdectcl24cue741/77838741681.pdfIn PDF document text
    • http://rotang.net/userfiles/file/tolonoxixak.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e4bcc9bdcbcefd3b14c65fe1e8560d06/rexegapizukirefibedamufom.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c80ae695d1---satalopoxilamadoxixasebe.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f6dadcf3916d8163de12145d6409327f/50768229452.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/aedf410fa03c817c12e0874b115da3b4/57896631962.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/782665e95dea51c22fe73c89a07235e9/wizitajifipotazawabak.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa769c8676c---bevemokekar.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/011f65eaa7c5c92684dc545f9d8726a2/62703679251.pdfIn PDF document text
    • http://charivne.info/images/file/basowineruvinewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 5504 bytes
SHA-256: 116de2beefa37e2c592ad1044896c4d234f477fb0c5472b0d46a863fa71ddf0e
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 10988 bytes
SHA-256: 8d14b8f67b9460b142eb2377c1cc03b8e3841fac48811065cfdd452c8a534b02