Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9296a22fc02fbdf…

MALICIOUS

PDF

80.3 KB Created: 2021-08-16 04:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 315b3dbeaf33dd04b00c2318a4447afe SHA-1: caafe0d67217ec16f1fac1798bbad150ac65b10c SHA-256: b9296a22fc02fbdfbbcb47c95805d9dac826aa582b43aa16e2483e0f7e17ef4d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories and other potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to lure users into clicking links that lead to further compromise, likely through phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/4ibehe2fbm9igpfjtip8u6imco/lalomezefojelijo.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109da0de5b97---95655811725.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/narinelobera.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98c7af045---49803671696.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/botari.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f749c164---vabazasinorazajebi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b18c8c45---77291150878.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/42961352293.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/29945732552.pdfIn PDF document text
    • https://rosycaffe.com/file/10414208424.pdfIn PDF document text
    • https://codecs.ro/images/file/15180056615.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9nkngu5uu9i8ka6v5e9008iock/widazabimupigu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff27e440f---99599728316.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/vojinufafuritujuvunaz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7fcd1f2c---24904073493.pdfIn PDF document text
    • https://unosms.us/userfiles/file/39827944855.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a3a1df02a---85523830614.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/11212915930.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc08081fab2---21493640534.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/39639250549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=retique+it+liquid+wood+lowesPDF 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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 10252 bytes
SHA-256: 71d987a4ef23887b44e8764fdcf11b7662ff9ed069eaf57c718e6a480a845b19
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 17112 bytes
SHA-256: 9f7a85d12d43a5c6511bf1e52f48ccc4414a31eb652ec79e2637f3069a84e050
font_02_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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