Malicious PDF — malware analysis report

Static analysis result for SHA-256 b943d4bcfaf23f23…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 07:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 37b6acb2fd8483285f651ea1085f8535 SHA-1: 90fecf8cc45fd03c6c49c3104102591311bd2b6e SHA-256: b943d4bcfaf23f23411cb27cb4c267abae54d54c1d7b9e76385ec5fc58a948ec
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/vnv869rtsesr41f1eaip7e6b1s/98614475084.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/39246e873e99f8ca82db0d829399fd57/18140961895.pdfIn PDF document text
    • https://alutat.com/data/file/fesivenipotev.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/36073323366.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/dadosepixijin.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d973436e11---14034472390.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d79602358---2157567999.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f5e23f64d18cbcee6ad465de13bc56dd/1424985374.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/lj2l9ttoatke813vdgmpbajdho/nosovuwizimivad.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/23760422125.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d13901eca---bebofirunomo.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/menalutumepedezenepex.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/805948d427704ff006f33df3820f0d7c/18665260704.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/37810554685.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/20223954263.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/pejeridibejudir.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/vogukejuzip.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/tirive.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01100d18f---wofigomorubi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/74f11cc1025ceb59e409c143ed55344c/kemalugato.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/pisisegolikuxizoje.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7285c3b74c---lezabesozebinum.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/d90999b72814a0b6098a8b3a87471575/duzimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+mutant+chroniclesPDF 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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 18348 bytes
SHA-256: 2cabe42dc4d3dd507bf823ab699c3019d164207c3baf4c1a3e78c7c31b5cf067
font_01_sfnt_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 10560 bytes
SHA-256: e0a209d3781e5aba038e1b7dafda91e1a72fa79d40a693605236286b09b98052
font_02_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.