Malicious PDF — malware analysis report

Static analysis result for SHA-256 f506fbcac8d20c6d…

MALICIOUS

PDF

92.0 KB Created: 2021-09-05 13:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7135c53a47823d166b4db84f6d2c42d6 SHA-1: d8324bc1e23288a434ac27434628b5040366747a SHA-256: f506fbcac8d20c6dab048053cb5f8dcfb8174a30c2a7e5b74649f2b0cb24c4d8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites, many of which host other PDF files. The ML classifier strongly indicated maliciousness, and the heuristics suggest this is a link farm designed to distribute further malicious content or lead users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=formation+windev+22+pdf PDF link annotation
    • http://svsteinfurth.de/radsportfiles/file/21719920713.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/u6fhlt9irk5ru89gq5290ho767/86922498873.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/27153131510.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/bixopelozopadir.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/27685206574.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/texaloxanifomulup.pdfIn PDF document text
    • https://forssh.com/userfiles/file/2366089069.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1deb9538d---36768536152.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d879f3377f---26265390042.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/paxanitozunoxep.pdfIn PDF document text
    • http://hnspkjx.com/d/files/kixatemularomajotoka.pdfIn PDF document text
    • http://abnicum.ru/files/file/60932248761.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a6a77cff2954ef70ee048f88c84aa833/xiwugunekagazemelikat.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/jixejedibilukewowawujer.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/riwuwumelemezetovejujom.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/3bcq1uevppr1q56fa4k8an7qoa/duxazokurigibute.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/48031311227.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/92988574080.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/minulofowisemefoxafepuru.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132e12f2ba40---jitateleminevafopomesowe.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/xilejapi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb099fa776f---90912516501.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc919bd84---3740668386.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/59671007251.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/zaguro.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 22508 bytes
SHA-256: 4748f5d4d7071ce8fc3981cf8f31df6b516f07387bd69713f4d8e04e927626cf
font_01_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1
font_02_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 16388 bytes
SHA-256: ccf72b37f4042dd64bb67a2e5e961e22b551b7a8a6449ae0c89ac042836f922b
font_03_sfnt_off00013061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14878 10692 bytes
SHA-256: a58d8de5eedefef7142477812fd681b455fdf936bf7a593cfed5e84f67cfb438

Open this report in the interactive analyzer, or submit your own file for analysis.