Malicious PDF — malware analysis report

Static analysis result for SHA-256 279c19895c25f13a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-10 10:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cd7e238d827fee2f7b9c2e00b830d542 SHA-1: cda678bc15cf6a86234845060bab2885d82df116 SHA-256: 279c19895c25f13a32c0a0270fa9731b95444fe2952f66390e2a1fc557d3548f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting domains, likely to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple distinct hosts and UTM parameters suggests a coordinated effort to distribute malicious links.

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 http://goforthegreengolfpools.com/userfiles/file/tolidoxinubulelereges.pdf In PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/77264367033.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/wepolagajoruxomo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/45919f8e13cf6329160e1c0340c74507/8719534467.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/66347740024.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2euu48q3vnd7m7bmneb50cmivs/55829967455.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/46aea3b4f294da4a8b4d08b085bba59f/28446672402.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/dativogojejinazitefuke.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/pofojuwomenesi.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/34962731553.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/4042179733.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/kabikejaxozivo.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/xisixajexabofewejogetebi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6ebe57505c5f48b92c32d3c2b32b2d49/46018196244.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/98880269739.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/molowavunenuvojefoxilot.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xosonobaj.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613673840f5a9---bobasozeditovusi.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/32105017217.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/17911663084.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/42652107613511fea147d.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/xowusegimuxadonumujuwo.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/jivolojajo.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/dorozopoxinusoxojejazu.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/biwukorenavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sd+card+test+pro+apkPDF 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_off0000be47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE47 17620 bytes
SHA-256: 5c9338340080bbf7998a2056771b40f3a2c4605504d6ea63c6fa26ed621a1eea
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 10432 bytes
SHA-256: 8f3722155026531dada450247e246c486b7368d3b260e6516fc034d7d1fa6029