Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea6bbc1ea2ab1dd…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 20:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1a18cfdc11f7a65a46be9f27ede9a5d SHA-1: 53121be6018664bceb835e09e3a9fde5c45d0d2d SHA-256: 8ea6bbc1ea2ab1ddd35af177ced5020aa76a5871bdb5095016a4fc1c576fb889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ee11547c4---goramubememixiradakalago.pdf In PDF document text
    • http://3xlove.com/uploadfile/file/16143565617.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/34425906384.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebd824020---56347951406.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210804_CD054A72F0577A06.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac17b026253---mubugukesivigeser.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/nisonumumolufo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8a827eda---4929142486.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f5a2ddd9fcdea4c0a9524bf0b8ead5eb/66018543704.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/sojunetej.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/danapesetaxutujobiduj.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c146e567db---wonojuvevoruduzebez.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/467a720ac20ee1f819e7de8a46b47af9/zorerelijajexibesez.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/suwuparisipixabirugorow.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/80770412386.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/77217344713.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/da2438680c7245b2509801a84d0d76a8/17759412741.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8122ab583---wiweliti.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/40013380198.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/58483364204f023f5d1db7009f16a4df/75520493737.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tunavasotaw.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33623267304.pdfIn PDF document text
    • http://12shio5.com/contents//files/56978519549.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qib7d3v2kav2sib4riig3gi00c/53184818798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=could+you+meaningPDF 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_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 16984 bytes
SHA-256: ce28b50e85f387a8d5f6a8ea61c3da8a79a3bcd426cd9e6a4c64a6224676f143
font_01_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 10472 bytes
SHA-256: e76e7260019e0a20f226c85430f7a09cf098e2bfccd03fe6b64a72ff6d369000
font_02_sfnt_off0001349a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1