Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3999bc2ab108b1…

MALICIOUS

PDF

95.6 KB Created: 2021-09-24 06:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7a340b2fb0d1cb80f097550c4ad6aeac SHA-1: ff929ed1aa52b3a5f9723954b61b7a726773524e SHA-256: bb3999bc2ab108b15fbdfdc2b2677f6259ffc5d9afafce73137d9325db5d3678
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term=your+device+is+rooted+meaning' in one URL suggests a social engineering tactic to entice users to click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crewmak.ru/uplcv?utm_term=your+device+is+rooted+meaning PDF link annotation
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/9161908969.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/45627713526.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/bodalale.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/4016898775.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/xuronekegugipogum.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/tatiki.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/titojenanupabasewivudevu.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/silisupalupibazi.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/65820157624.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/duwipodukofizov.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/rinexajudalobuwu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a8dbce6a0a202697f9f25b21e8599c09/javakeno.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/rigixumirakitukukap.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/90247348994.pdfIn PDF document text
    • http://kahasat.cz/data/file/koronifewukesomudatal.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/41431437559.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/xujatizadozimoxeti.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136522108eea---fefig.pdfIn PDF document text
    • https://razredna-nastava.net/files/64951123901.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210901075316.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/73401892218.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d574c3b4a75e162e175f345266a89a22/widabipidowijilogatovuf.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iokv018lhj0btkn4bi2ulcpq9k/29385518710.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 18740 bytes
SHA-256: 1b80b7939bf2b852334fd696490066c3d77eb5b2fe13bce5040da97568a5e863
font_01_sfnt_off00014015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001582c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582C 10816 bytes
SHA-256: 6c2e70f54c69f369c8e8db9d89fc3f19aee30372da8a3ebfd057356df55c51e0