Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ccd35073f0dc32…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 00:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ef7c13c22253b110e36c8e8d33aa35b SHA-1: 41fb9a65aadbdc38aacfbff81d4866ffa323de78 SHA-256: 45ccd35073f0dc32f83c1cbbf0e818cb2caaeec0e567d3e12e832320e7c6c7af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as phishing-related. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the interpretation of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://mientaytourist.com/uploads/files/rilefepugakirusi.pdf In PDF document text
    • http://bowie.abwingsmd.com/uploads/files/70674826091.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/43cd91f023d3ecfb4eb57e432f3ee187/pilanuxuzase.pdfIn PDF document text
    • http://homeopathyhk.com/files/66059794949.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/2fcf309c6f4ed3416f3d3e5a0536248e/38346121837.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611d602d81da8---wudenoj.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080adb5b81a3---82826964881.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffb7e73e7---ganosaxaze.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/80342722436.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609441d54483c---gigakirid.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/33110944190.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9317ae00dc32343664e3c0aacd96b999/faxon.pdfIn PDF document text
    • http://yoron.net/up/files/79022629344.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/rawapukareruxaxuwe.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/40085483652.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/83896737319.pdfIn PDF document text
    • http://www.bash.cl/media/file/28744812360.pdfIn PDF document text
    • http://bawwabatrizq.com/userfiles/file/nezulumamipob.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/21936370040.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/26765264345.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/zarexirewiduruzuges.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a476f812be7---pamavolijuwenopizukerorat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=manual+book+mixer+yamaha+mgp24xPDF 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_off0000bfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBE 17964 bytes
SHA-256: e6e77a6f996d7f1e1a626ebebb5c8871018f902d7462de0335201bd798482a0d
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 11172 bytes
SHA-256: 88c365e3dddc2ee61aff24e224036f26e0de63f0154ffeaee3e94985722b5772
font_02_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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