Malicious PDF — malware analysis report

Static analysis result for SHA-256 191e58a972130ed5…

MALICIOUS

PDF

133.0 KB Created: 2021-07-17 06:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6af8ebb9de24ce32cfabee52266148a SHA-1: 562df5951400fdb7a163b2b0043b8d1abd070bf4 SHA-256: 191e58a972130ed5e2ce21ffc1d820bce1536c4e97852245de1ec7444c0c736c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to potentially harmful content through these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a2c3efe9f9f992b633559f689b7c6a24/65141212674.pdf
    • http://gemculture.com/userfiles/file/gamoxolilajenakoziwazutuk.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/33008668533.pdf
    • https://my-natural-style.net/upload/files/86111608494.pdf
    • http://sola-brothers.com/userfiles/file/xopepusojimiluzavomi.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/15158398114.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sd07up7ii79ub6hri58g3tr4ef/xonugiketakizaredelugisix.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/51bc663bfbe9f4d70c97d1e6e3afc35e/50189090909.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/r8gppm9mqq8up5uvtjaknhh7vv/52795977920.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/522oq43trb5dm8qr10a4k9i1mp/niporidax.pdf
    • https://sasalidayanisma.org/uploads/file/dunobajujomukudagusakukol.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7594e3171---16601115397.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/banomopezu.pdf
    • http://samurairamenbar.com/uploads/files/10792049482.pdf
    • http://szakkepzosiklos.hu/upload/file/sotibijudokikakukiwewuvi.pdf
    • https://hideab.se/tc/Mediagalleri/file/dopexadili.pdf
    • http://chokmanee.com/userfiles/file/kubido.pdf
    • http://thekitchendesignstudio.org/uploads/files/73557613540.pdf
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/tibisexamuzomesibevuzuzi.pdf
    • http://satisfytech.com/ck/upload/files/3409093998.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/93aa3b8f21e40605dbad374a6fd097fb/bijixub.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/gadifu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0559614de---24592233741.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3edfd53c27407afede9120d57f119a34/fatov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gender+and+discourse+pdf
    • 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_off0001a19e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A19E 16792 bytes
font_01_sfnt_off0001b9b0.bin
4ce67d56d0ae96c8b1c19f57108a274b9e68a6e38206b1cf8ea286d575a877db
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9B0 20308 bytes
font_02_sfnt_off0001ecb3.bin
e75c4bb75aa317fb7647eec943cdf856bc39c5ab59c158ceaf628caff4244d81
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECB3 10608 bytes