Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfafbc4ad1dcfba…

MALICIOUS

PDF

83.0 KB Created: 2021-07-18 18:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a8f99413846cabb8c6d4ea1dbc163456 SHA-1: ca83bd2ffc0c9eaf07e2ed01310253cb0d7aa290 SHA-256: 7bfafbc4ad1dcfbaf9c9b7c4bdcada776716b33645590a9c1633ae98cda756ce
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS platforms. The presence of multiple links on potentially compromised sites suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pametnidom.hr/pametne_kuce/userfiles/file/ramefebegaguni.pdf In PDF document text
    • https://alarrabnews.com/images/content/content/file/61019682269.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/42320893582.pdfIn PDF document text
    • http://cwesp.biz/upload/file/zuvativenijilibelofimof.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607df788b5906---disogujiriw.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/36185554109.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/dchkstrekpopoup51ofrccl7al/meviremigumigeka.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097de3cde325---kavovikepuwubutero.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087402f77daf---bezupe.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160909b2033985---25939908196.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce753f7bdc3---nowakifonukamejujiruvilul.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/56297467958.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/868c2a480b7a95c1f934ace86100f416/13796399958.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2dea285a---30119905432.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b784d46343cbb6b136a23fd0d9a3a5d6/fotododezefeju.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b50c7d59---numebimopoverumekaxug.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210701224251.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/zifekedas.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af697797a72---xanowiwuzipekovik.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sejotagebobu.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/66964523015.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcdd7f129---ravusanopijemuzevi.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/foxigiwojusolupopudulu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cb299db68f31e6837c2120e49f3752f8/keporedabisewonewazojuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=charlize+theron+aileen+wuornos+monsterPDF 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_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10648 bytes
SHA-256: 920bd49eb99d5a5bac6d4e9f5fbcf22a6e422c9413e6f3aa5b62fc7a5ba6fdc1
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 17104 bytes
SHA-256: 9b79d467580e392633a65bee210547ad0b7dc8d3635b64bf5cf8778d7a1a3991
font_02_sfnt_off000126b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1