Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1719500b44cb85f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 14:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b094e06a5dbb204d94b8252994d15b19 SHA-1: b59fe65263b47451f68bd8304fb90a1eafad9d53 SHA-256: f1719500b44cb85f75fd37c95df00e7eb8b1b5815782d0a0036a29aaecb879c2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=all+infinix+android+phones PDF link annotation
    • http://c2ctrading.org/cms_upload/files/55654441440.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/puwegi.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/33314200873.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/mibonagezizuzat.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161372c7e2fdc3---danadaxomezevogufiwajo.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/68451279509.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/44196868480.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/73918537697.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/kokasomivoxoruvop.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/pikugowepopo.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/lomuliduzajadupizirej.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130afde87fb6---zejuvonami.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210906170456.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/mopagubasofadu.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/weboputoradebi.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/21438271864.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109012138132779.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b13321df99---75818324274.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/95894945524.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/35868259839.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210909175748.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136e34abaf41---79848980986.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/fegulimuwin.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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 18176 bytes
SHA-256: bd4a6cfcadcd6dd60830bdaaf365546ee9819969983359ae5d9e76b762cb0966
font_01_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13217 10580 bytes
SHA-256: 0b7e30e8023f905017c9c147b40cf8e6daac64da99b632e55a9ec76c751051d9