Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a9769ac4e2f43c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 15:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1f3ee93af031c681a46b89113c8bc29 SHA-1: 218a99e85960217c645c5ca83f249691f4e2cce0 SHA-256: 66a9769ac4e2f43c4f6a5e2d8b5594bfe6fadcbfd76afe01b959e7d77d1d3dd5
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the true destination and evade detection. The PDF structure and embedded links suggest an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://happy-travel089.com/CKEdit/upload/files/97424892432.pdf In PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/65112030957.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/90760361403.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/paduluxigulogifewibarugo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc6fd0ca11---11494505884.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q25u0thvvh100149s4bbejek05/81896494652.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/vomomazedixiligurijidam.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/95273347696.pdfIn PDF document text
    • https://masukpt1.com/contents//files/50879590519.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/90433690091.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/vebise.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/povikulatavilu.pdfIn PDF document text
    • https://migger.dk/userimages/file/64703266237.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/40972122079.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/86277269824.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/42186703255.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/murubepa.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/luwoso.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/79668217039.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/74296834258.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/nutewijov.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02030a7ced---93239192548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=science+module+grade+6+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ccc2e66fee6f3f1544c09682bdef4a3b/fazamiromekaw.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_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 11040 bytes
SHA-256: e03f1bb796a27663bb3d910ac45f1b56c02f2352a3564234567c83f27e71d547
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 19664 bytes
SHA-256: 0481ce40b4d57d6741ec6a6c1e2f950cd3bceb3e76c619357ea25f3ce71ac4c8

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