Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1850bc666567e2c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 01:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7b17b1e0c0b8de255032e69cd047df2 SHA-1: 248aa97049ff59f6aa9cd1308d2285e8ff632b02 SHA-256: f1850bc666567e2c5443c164687f2037277a9d16c6555d1080afe4742284e12d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI and link farm heuristics confirms the document's function as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=total+sms+controller PDF link annotation
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161403d8342ee4---molibekenurug.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vobaw.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/30148365686.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/3169682528.pdfIn PDF document text
    • https://rintrans.com/files/sutamatekaguvadakileborij.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/mozudulukixakivumizit.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/xevepilugowomusobozugari.pdfIn PDF document text
    • https://funke.be/data/file/menizatu.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/96293979432.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/jagiwanopatadaloxebogef.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/24305294655.pdfIn PDF document text
    • http://kahasat.cz/data/file/bevupako.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qpetcavu6tcqlje0k41aru9rdt/83235602938.pdfIn PDF document text
    • http://fitviewer.info/files/file/24838961329.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/28689433089.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/36573178100.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/zudovefarive.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/kefupenajititojebufemi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7o12jb9i3a50k3buah4lmbcgc5/12299469705.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/futigutivugerenajoxetul.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_off0000bc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 10260 bytes
SHA-256: 7a2719007dfe3630ac105b58d3645d9b366e05a71f2286f4006897865ca683e8
font_02_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 19788 bytes
SHA-256: 2f3cd29f91b296d3bc8a32f47c2bd39a9660718b4275079b53d9d9612da87510