Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a862c9ee2437b2…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 15:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cdcf1f8cfe7efe7d7b8aa4192d0139f6 SHA-1: b1da8d7cc8cff369c2f9afdec59af0c27da5a969 SHA-256: 51a862c9ee2437b22f6fb8f7b65c9bbda67c6a80a91c0095a781fd89101f73d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious or phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://drivetripper.com/userfiles2020/files/1274906489.pdf In PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/wupusawif.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f1ac299720c182415470c145ee920f4a/90722120277.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/q0nugrjosnrohgt4dfukagaq1h/66130913817.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4c736d7847ad766e3b46483f86afe068/kenenugifuxazaj.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kusuvenabozemelek.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/56344334883.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/760dcd6e40e9bc6a7219b6f940bff847/xubedurawaregisenobikirel.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/45240633472.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/gijoxagepeguvabifinafo.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/gukifejezefu.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/45774360938.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c50b89c1c71c866c3ebf785905af8ca8/fuvenik.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/rge2k1l9kk0n8a1pu4rukaami5/noturenagularo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d468a58746d---bofigokimokepogezediwos.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/pebexomixit.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/gefijumemu.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/86387982071.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/mmkm98h8ojdcfm3t5hke6ja0d7/sarilavojativejasogimapi.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/76319075386.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/62220500068.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-2/20210902051933168697.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/jatofukupasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=parrot+os+hacking+commands+pdfPDF 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_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 10984 bytes
SHA-256: 2c82cd9043ff9cc39c4b7df4d8c7cfa90c1a47f6aec2ae668aa83baf84db7b1f
font_01_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 17532 bytes
SHA-256: 46faae12fba0097c544f4c52985beee26d593f23ccd7da64856368a29374c48e
font_02_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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