Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e006b73eab5115…

MALICIOUS

PDF

77.0 KB Created: 2021-07-18 03:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 772e49a2d85b7b507f9ed57de5ee84d9 SHA-1: 0b739369ffddbe17215d40ce5e83a5e0c433223d SHA-256: b2e006b73eab51152e678dd5b87f545700717cbfce141b139ca665c49108480d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other potentially malicious URLs. The PDF structure and embedded links suggest it's used to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8aq1tpj3ccc6fvkh4bist7sbnq/15594878629.pdf In PDF document text
    • https://termocasasrl.com/file/54615298635.pdfIn PDF document text
    • https://asiajitu.com/contents//files/43929402782.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/f6uctut4g3a6b40258282v8vi0/49143147629.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/92941171843.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/10389964121.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tofusasawapil.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/75174614582.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/vawuwi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e929fa9c6f8---26325455496.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090224d8e535---gopufe.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/rq991u3bv6ucjub9p5vmq6u9en/24739155978.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/uvkg7mkk4qug6ob28t6koelqk3/72174858727.pdfIn PDF document text
    • http://lucann.com/Upload/file/31742881342.pdfIn PDF document text
    • https://nicosiacaffe.it/file/98259918641.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab074a06cac---zejakowokeselidugawop.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/13812131148.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/44739466318.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rbg95jn633i70ammgsha695ekh/71016813703.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/zoxazakuwogetu.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210624_878126F2E01E866D.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f2367712---nokivakibazimiwif.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/10355843497.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/90916975307.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/wobegufokituvavutox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=crossly+meaning+in+kannadaPDF 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_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 10732 bytes
SHA-256: 5c49516af524c28e07bf836c3199292d24adb8be6c6ed83d050c8066164cb17b
font_02_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 17092 bytes
SHA-256: 71874ad1dca374af2247c1081c5bef26af929d3590d1875897265b7a75e29fa2