Malicious PDF — malware analysis report

Static analysis result for SHA-256 feca0707577757cc…

MALICIOUS

PDF

90.2 KB Created: 2021-08-04 10:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5b11583d92d07014301885ae5e952b6 SHA-1: e118ec11fce34ef1c3ef85f6a58505847c742b18 SHA-256: feca0707577757cc1dedf3708ec6adc603c67a3bbdff495204c1708fd1ac2585
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs that point to compromised WordPress sites and other domains. These URLs are likely used to host phishing pages or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=can+you+get+a+false+positive+pregnancy+test+result PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7ace1dcf5280754f740c474d8ed53f55/nuxufagugumawapojotajufer.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/fonegemezinazu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e14eaa65d---64512173893.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/40280657079.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ikr347q5fs50hod8agh0t4c9r3/xujinuzitemok.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/47807527651.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/mevota.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafa13c479---tunikes.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/lojomori.pdfIn PDF document text
    • https://andrejc.si/files/file/batekoge.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5a66e872e---96378697773.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8046edd73a---fepedijimuxudivabas.pdfIn PDF document text
    • https://ebooksweb.net/files/file/zatatem.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970c9f9f2ab---pilojofekebilakiji.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/42263573600.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/037d1e6326bd14e85dddbf30c0cb1a66/76012372258.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/resulanizijare.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/fugitibovudujilokiv.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/fv9kor1u5oqkoauo0apb1ncb77/1963667804.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ddee72d6776c991c1770b02a6c4a6f52/nerisawilalezuzipe.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/lesejapafogalugaj.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/lda2dj7vjkk4ud12ish7pm3b41/kevupinusijako.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/67182591957.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/lavad.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_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 17288 bytes
SHA-256: 66b3bc344bdf64bc9fdc63f84ef69a7a24ca6134ad4daa46fc64d5552000bb67
font_01_sfnt_off000128a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A3 10964 bytes
SHA-256: f3b6bda7e27816284f92b77846631cd33d67393034a7a7e4db4629f5950bf31d
font_02_sfnt_off00014256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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