Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6e64d927667033…

MALICIOUS

PDF

145.3 KB Created: 2021-07-19 08:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b5123a6d2fe85d94568b0cd3307da980 SHA-1: 9b7137ed36fd9af40027c18f4ca2af2da8860bd7 SHA-256: 0c6e64d927667033aa1c53e847257fdf7d9ae8a0a7cbde4ff7710003c2d0169e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress installations, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a04569025---vuparofumefaxonetoris.pdf In PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/tuvaposabukuzivagukezepu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d066233b0a4---79982541745.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/04ba0b77e9b7e450cec2084ca96e1e2c/49833599054.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/zimidutozutozikopo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tcu8v15v1f6js28ol8d6c53gin/dozidute.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4da9b16f584045caf24ad449c5f4b377/86031957059.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a17288289b---xamurosazaweg.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/milaruxido.pdfIn PDF document text
    • https://dineflon.com//files/dinatanoxefil.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae3155e37---83795492536.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863f330b774---zodaxirimo.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/43597909741.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a1b2426f3e5efbff822b3c89bc48471/66232094570.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/wubat.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-15/20210515055255855975.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/sewifugemedenenuroweri.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7c231ebd---lizotazan.pdfIn PDF document text
    • https://hirurgija.me//files/pipozulaxemi.pdfIn PDF document text
    • http://intergeored.com/upload/File/39195431059.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/bb221059693c5ddf457f668d158347ba/gojalo.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/57626872351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=simon+solid+state+physics+solutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB0A 16392 bytes
SHA-256: 91fe64ac94750dd52e048c43ca0a899dea937adb726ab529f1ce9060364fd090
font_01_sfnt_off0001c19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9B3 10968 bytes
SHA-256: d1339ae186f22676888bd13656e4a7c20f7211e6b791405ebd008acde3ba724d
font_03_sfnt_off0001f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2EB 24892 bytes
SHA-256: 69d90b94fba57770250912be8a0128f6c94d1455dacca0fe33b00e78a663b961

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