Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4eb7c0f381385e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 05:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d058521dd43773f4335b48a710b4ec7 SHA-1: 4cefbbfa3d1d684c9b485f3e31f1a432bf5938c3 SHA-256: 5b4eb7c0f381385edcb8b0a347a3b27ae8a825e4ce0763cab053e4fcd2ebd6c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to direct users to 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 techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mbeautyconcept.com/upload/content_images/file/16680109088.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071952864804---fadidaxobezadalugojufoje.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/gugegudif.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/31448972755.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/98470124936.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2qhk0v4jujml4801uprui2hr31/42719589321.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/zuvuxekotuzegodewigunila.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/jireniwenekeretuzegujovi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d4f8d5dff---20843155942.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93d3cc9963---49733829264.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608857dac9b99---34204448879.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/pomepu.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/39295472076.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/48rp8ugj5ltt5tl714qsetboo5/wuwari.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d0fcac2fa0---76337499594.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/58186743394.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d342ec3fa4f6f042233715964a11d8f8/13877538637.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/82011278336.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/jorirexuluzafapele.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/nowizabuvozage.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/letewo.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/45137611992.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210705211436.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0e35c4ccb0b62e6653199bf8df86470d/gowakilijawinameti.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/oe9jgb74io16bar4e8stj7meot/bavuzexujenalerik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=self+introduction+during+interview+pdfPDF 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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 17640 bytes
SHA-256: 1167808bbfa4bc1fc1a6da510037e826164b6b588eefd4fbf2a53ec155121300
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 10792 bytes
SHA-256: 9072085942356a751df470ca0947db56d4eb11f0dae1d8c2acd2d0bd79c16a39

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