Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19ba3d44e14a25f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 00:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a59188b9696cbe7bf59c2159414170c SHA-1: f5aaa595a0458afa626b0b02e76ede3c13b37576 SHA-256: c19ba3d44e14a25fecbc788b08ee4ff231b5aa1fcc48e43917d9ec203ad94ffa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to numerous external PDF files hosted on various domains, some of which appear to be compromised upload storage, suggesting a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/5308205307.pdf In PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gogubatizobub.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/famajofufikopigoxudopi.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/vibamewopage.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/gekawelitubokaruzipowig.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/8510334064.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f6af7438b0bb325a9efbf22df4652093/70802749382.pdfIn PDF document text
    • https://guijek.com/userfiles/file/rasuzik.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/42198216522.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/fobilanizivun.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/tapegekasujajodekenibu.pdfIn PDF document text
    • https://bselink.com/userfiles/file/80382187061.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde9be54c3---94900464960.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/99779696209.pdfIn PDF document text
    • http://chpcentre.com/files/file/guvesupadodinebus.pdfIn PDF document text
    • http://iphysiology.ru/upload/28179360332.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/buzajomojuruwo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed42e900f---zesusonawedesunojolav.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/40728058363.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091416281235.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/62528051716.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/xekobomabojafida.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/14042027789.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/kurexafowof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=friends+reunion+watch+putlockerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB998 10864 bytes
SHA-256: 33fd7c6299d7d499d4969a4317595fb5823511b91ec61c43ab8e6255f103263e
font_01_sfnt_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 18444 bytes
SHA-256: 38cb980b7f0b9f5790dae716d5a63290672920c1850987e183b8c90cc44ab9ac
font_02_sfnt_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_03_sfnt_off0001169d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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