Malicious PDF — malware analysis report

Static analysis result for SHA-256 149dd44d2c3508ab…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 12:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e04569f56bc2e758b7326585302efaf0 SHA-1: ba473a953fb2a11d3a281696a7e98604c48d3480 SHA-256: 149dd44d2c3508abb0f2c08e94c494176f84c066232a84ef2fdc2a44acdd147a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links suggests an attempt to host malicious files or redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tlumacz-lipno.pl/pdrzewiecki/files/lerizu.pdf In PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f16eddc5bbc70f88c4b3b196cb4490f9/44876180407.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/16878185337.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/kudadivitatukegozaxisuku.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136edafa6c86---semedujosebewasawizi.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/kapavuwe.pdfIn PDF document text
    • https://kapefashion.com/files/files/64025029719.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6f28901c---kezifibesizubutubesifebe.pdfIn PDF document text
    • http://uchid.com/uploads/file/91238568549.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/61228635286.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/87016561548.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/jitudanejivivoxarezusup.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/wefiterozoworoje.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/91623441512.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/lipadatoduto.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/povurawogefigi.pdfIn PDF document text
    • http://bankerz.in/qpic/files/80570311680.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/5693591214.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/10677057055.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/vuvaposasepatumizatuvu.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/wifegavakejabekutufoge.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xizosokitimemitunanad.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/57208797932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pes+2011+android+play+storePDF 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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 10796 bytes
SHA-256: 4704aaaa911ce69ad1654b97fd6125ed20838673db9bc23844d907058b44873d
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 17488 bytes
SHA-256: 2366748dcead7857cfc8990ba6fb01b0a2be8ac3ac6cafc77ba72d45be98c88f
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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