Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d0b58b427d9a1e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 11:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2f94b3ec39bbeb7270031c251a79778 SHA-1: 302a9bc4040f02c6351647535990bfa7873e6f27 SHA-256: 74d0b58b427d9a1e2eac1c4c19bc26c71234d797735611f09d7f9af1b7acab7c
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to direct users to potentially malicious websites. Specifically, it leverages compromised CMS upload storage and disposable hosting, suggesting an attempt to obscure the true destination or host malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b47a481325050a0856f02192c11f0fc0/gedevazejim.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc03f90670a---85783549462.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/zatofofezitup.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/nikasivepifobiv.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/derow.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/66431988287.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4c15j6bkrt4s0manuo2k1ltk83/kitatagijodivukirekos.pdfIn PDF document text
    • http://mebco.ru/images/file/72606300117.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/53986882966.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/bad2d23833772be18ca34317ac172dc4/30787037792.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4af187c42f2648d908679c688825d92d/54489538758.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/86411753176.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoxefipatepix.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3881fe61169861f4af19388748640327/rawowotirawokizimekegux.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b0b233a0d---ditokilunosasonit.pdfIn PDF document text
    • https://kuepancong.com/contents//files/vujokorirulerotujapunaw.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/muzufepugivelutadatinexo.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/fodotor.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/60102948171.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd73b8904---xovezunakajefarifenibamo.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/kelefekimipulaxoluvaz.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce5ef5e926---50641070624.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/sedidozolimazugupe.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/28690221649.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/xekagawuxomodewawo.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210825_1AAB10D5A30D3332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=15kg+in+lbsPDF 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_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 17488 bytes
SHA-256: f45bc35145d80e1d58ff15a0633cfb6b1226c11b7ac79de5f5cd4234c1ede53a
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 9992 bytes
SHA-256: ba835116adeb28da8e7b5f5b5ef9f79f9a37cf653600b1c40df8847d136500a4