Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7541c0e20cca89f…

MALICIOUS

PDF

101.1 KB Created: 2021-06-10 07:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 45343ddef4ade89b16415d47853feb6d SHA-1: ab62a2bfe07fbb28631f1f0fedd124f297a77255 SHA-256: f7541c0e20cca89f127aa6f691dc1b95c8d2a8878285a3f797230404f0811533
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, many pointing to compromised WordPress sites, and one external URI that appears to be a redirector. The document body, though heavily obfuscated, suggests a lure related to a specific book title, likely to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=lange+clinical+neurology+and+neuroanatomy+pdf PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50070ff04---kajizavulitujiduzori.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37832f748---labewisudotidefa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/58158ae4dc3e11fe449fe6000a2a8274/lonamozinezupene.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/dizevebiziroguf.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/368266d9e802ed01fa669c3646722787/vafabagukamememuxoru.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860175d5b92---ludavimedigorupu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/r88o44kv1cu77f1odg1b3rcisi/51153100152.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/3cm9bs71ilv8ksmjium501o9go/totapase.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/xilizezivewovifefojara.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078309551d78---22914821442.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0b572cd7cd38ffaf6b3daf8965646099/37918836368.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/wivalujewuru.pdfIn PDF document text
    • https://cecprint.com/images/file/95179997224.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/xaduvitoni.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/npbeubpn35eqlm9ptfd17odr31/98675154417.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7iihnslfchplr7fi92tq5vfupk/bafixojojevazopefovofonuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 31316 bytes
SHA-256: 057568be015d84301b2cdf205ad5387f805c1521b59b3b6730b6033eb3e73b0d
font_01_sfnt_off00014dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAD 5340 bytes
SHA-256: d3fcf5565dfc24adb19efd7ca2f19f3a14296707ed0a0df2c0c06f5d517b7ffb
font_02_sfnt_off00015fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCF 11488 bytes
SHA-256: 6d6793c9fe87739d209bd715d37a6ca055d4f6c9a221945d52eda8b202ff13d2