Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a274e13bf438124…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 03:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca28dd8bf69bf5d8eec1795210c4c9a8 SHA-1: 346f3c75ce9774db21a38d717385624b5638833e SHA-256: 0a274e13bf4381244f1ca9bf467974d354876c475f37d4cdcf6549d2c1066180
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://thaymanhinhlaptop.com/userfiles/file/80535308902.pdf In PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/74559533039.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/lodujajejopopufoni.pdfIn PDF document text
    • https://kopari.hu/files/file/44457910948.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/2225764997.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/wopudizabekadesitapu.pdfIn PDF document text
    • http://rcot.by/pics/files/zamujosinemon.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/gulenixumaxudofudo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7ecf2004a64d0649d2aa95a85170afac/47685094073.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/nifikaxujimif.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/pagomupisepuzemuve.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/mijisedavored.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/26844682396.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613487f6e5c29---57074757887.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/68294454101.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210909040347497145sgmp2.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/tofisefalisirulu.pdfIn PDF document text
    • http://sial.pl/galeria/file/telapegixufuvamites.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/mowofewamofuleput.pdfIn PDF document text
    • https://reniuved.it/file/17150772546.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8bb5fd10---87993634380.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/428620794.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/20652080888.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3c4afdf1---bonamisafomamavipivaper.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/46138798888.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/65913197895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cinema+hd+movie+app+downloadPDF 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_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 16924 bytes
SHA-256: 944c4d1986005e32ee04d3d1b9fcf89f960ca85a4a7c28fb635a561fb31d4aa3
font_01_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 10472 bytes
SHA-256: 666e84b622ccaab77d7373a9555ca0e7c9dba34676d9c5e720ad060f6156ccc3

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