Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c615102e0b1652…

MALICIOUS

PDF

84.0 KB Created: 2021-08-30 16:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b6efaf000d7dd5ca247370ec75b64c80 SHA-1: eee9fc9622fefa72153e512b3dd97703fcc01ca4 SHA-256: 92c615102e0b1652138f72d36345fa826733b65b135a406985b7727aa16a27c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to deliver a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=mary+douglas+implicit+meanings PDF link annotation
    • http://youzedu.com/ckimages/files/20210825045056707543.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/38766443947.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609735abd0c4f---mesorezikak.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/24467510826.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecc6b539fa---98671853263.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82f0ccd94---guvimisujesunefaj.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/87456329329.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ae5d2faa769d490f2eed7a6d5e832bf3/jamelaxikitedizoxusugi.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210814221055.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/11748604077.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/62676629223.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/21844082277.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/42946475289.pdfIn PDF document text
    • http://aps-mes.com/files/file/93714685977.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/sodebezowo.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ac2209fec24b3014b823d86c5d336830/5128310947.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/fadisuvotojifu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d25d86f81e68d837a88307ab381719f4/31739020853.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c298b7883e---97824712585.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/fimij.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53f7cd89d---tafoxegimudexugujuku.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/87401953694.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2dce221d7677eb47285883a9f642b9cb/gabokiwabuzexevetifepekel.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/semifikobidelonunimo.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 11064 bytes
SHA-256: 2bbe06245f7a1e01275181b40e77f2cc9f1229d769fb9fea896495002b6cc5ae
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 17496 bytes
SHA-256: 9d1dec49ad460bb283e1ec6dd4fbd37aec189ea4aaedab1c14e7ef6dffde202a