Malicious PDF — malware analysis report

Static analysis result for SHA-256 c552dafc9fd085c8…

MALICIOUS

PDF

74.0 KB Created: 2021-10-08 21:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ef23b2347ca1f3d7f82cf5b7323dd2e SHA-1: cb4f46f4b99a5f39a9902a158ee195837457c40b SHA-256: c552dafc9fd085c8d5b74f5b45fec7bdc7e1284b83293e9783ce4d45679531d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage or appear to be disposable. The embedded URLs suggest an attempt to redirect the user to external sites, likely for malicious purposes such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://urologasdainys.lt/userfiles/file/77526489222.pdf In PDF document text
    • http://foto-recepty.sk/images/fotky/dutatizaxudupobedufedixow.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/domebeku.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/4221369597.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/41626486090.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/30171403199.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b43ae9d4f3---12004060260.pdfIn PDF document text
    • http://slipa.site/0429/upload/files/51176350855.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d62527354---pozoresazexizakaza.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/10281152843.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/wajorupik.pdfIn PDF document text
    • http://usagimatur.com/files/others/71643620214.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/43212140317.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/25337563448.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/66701486120.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/57121855348.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/29159503498.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/91427964621.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482874b424d---jopawesoxejujiminawugur.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/dazewajisegozezali.pdfIn PDF document text
    • https://capecoralliving.com/media/file/waperisereniv.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138190f9e124---vapabage.pdfIn PDF document text
    • https://huanghecables.com/d/files/wutomaviwegezizibib.pdfIn PDF document text
    • https://baptistfriends.org/media/76447709716.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/rifomot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=thalassemia+patient+can+be+pregnantPDF 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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 10804 bytes
SHA-256: da0eaf427e8567f00537af1e327ad44a274ac467fcdd16f69ec02204978f7d1a
font_01_sfnt_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 16488 bytes
SHA-256: d3f2d0ae1a38e949a397f738fa17f5b3affdda0eee9d6aed4d6271ccb9ac5bcf
font_02_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1