Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf01809d8e2f81e9…

MALICIOUS

PDF

93.5 KB Created: 2021-08-18 00:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 51de41f3fc39799f7cd8f92c92160e80 SHA-1: 2cd8e8cf4dc9356fc9ba9233c55608ee4efa7dbd SHA-256: bf01809d8e2f81e918ebdd4e2558b14105415f9b20cf8a25d8d46d5346f81834
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide readable content, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://allytemp.ru/uplcv?utm_term=genel+muhasebe+1+vize+sorular%C4%B1+klasik PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a506cbc91d---36241231895.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/3071695971.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/dopax.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/40188732448.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5b4b9e76e0434b54b4d623b243b98856/85095991548.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/10929936964.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/93774253092.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cab428c928---gafoluxubukanivogotatub.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/92f3a67ee8e1794274262e161434f196/45674226242.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/ponojin.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vatijanaxexawewukeguwubo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608470ed9be27---tisikemogajemewanaf.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ggm2qutrh0mjcu7orfmrmpffi0/vetivibupepemebukosaza.pdfIn PDF document text
    • http://wamer.org/userfiles/file/99054774274.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/23963766830.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/lukej.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28437776666.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a044edd7f1a---10899484379.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/91986652530.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/25nasakkmdvea34kn9l9u18ak7/wozamedodijodafekijuwej.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/18496549410.pdfIn PDF document text
    • https://altbuket.ru/files/wegosagumemoguxedukom.pdfIn 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://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_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 21340 bytes
SHA-256: 32ab2101850dc27480106d7f8b46912c1d8efd201715632d191c370e532be7e9
font_01_sfnt_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 10872 bytes
SHA-256: ba23b1dbd4e9d92705d83e350383dcf98b16c1a1e77003e2cc71448ace76cd29
font_02_sfnt_off00014d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1