Malicious PDF — malware analysis report

Static analysis result for SHA-256 b085da47208e352c…

MALICIOUS

PDF

79.7 KB Created: 2021-07-02 00:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99a798b76a5a631550529b30b003e42b SHA-1: fbaa0b564e867607a87a6e4226f78fb30e0342ca SHA-256: b085da47208e352c72229effd310360f347b43a1341f5fc2a42d02dc30e98998
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the heuristic findings point to a malicious PDF designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/8elr2gholc6kq9d4agdakdr390/18945233519.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ab73a21ba9a---sakew.pdf
    • https://gruntbudowa.pl/files/file/vuzoxu.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t7317m6ds47k2ggiuf79oo76to/fodetoramibudawanasavap.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6e02b50b3af6363362d626504a59bc9e/11990541654.pdf
    • http://memphiscentral1969.com/clients/865565/File/memopegexiwoda.pdf
    • http://dichvugiayphep.biz/upload/ck/files/66807400803.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a34703a335fade8c707dee2912fa3abf/67671642068.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a922472cf17---81252871492.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083cab81e4ee---zumetibakefodurugebalufa.pdf
    • http://vencedor.coop/images/admin/file/dunegajo.pdf
    • http://nedirajtebosnu.net/userfiles/file/penebapukozanivuzukosak.pdf
    • http://iamsong.vn/uploads/files/55030122095.pdf
    • https://palcev.ru/userfiles/file/mogukatiriwifimogitabepe.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ceik3h4t5d7o7488nhnci983hh/49902106353.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6803f9216d---27517021026.pdf
    • http://afghansolar.com/userfiles/file/deraforaditok.pdf
    • http://flexicourse.cz/res/file/93137092295.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094529c2dc98---guruga.pdf
    • https://serwisnawigacji.pl/userfiles/file/50249094027.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc823b3523---ligozovo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=airedale+terrier+puppies+indiana
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d598.bin
cd8a6fc58ecbf90eca35213ebe88ca646209baf34a42cf0cacd39350bacae465
pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 17068 bytes
font_01_sfnt_off00010219.bin
d57c8e2027466d61ee51290b8a1aece84fa6301b22092f5eb06adf926792c193
pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10348 bytes
font_02_sfnt_off0001198f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 16792 bytes