Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc26f0389305e58…

MALICIOUS

PDF

71.8 KB Created: 2021-10-03 05:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3eeae896ca628f29ec28eff205242a9 SHA-1: 12d66fd5453513e77624d0e16a6df9192c66cdff SHA-256: cfc26f0389305e58039790e799f38771079e55bd9c3c66dfd4b6bff067b77e7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely serves to obfuscate the malicious links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tanabuauto.com/js/upload/files/98357753391.pdf In PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/39920645209.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/vagudin.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/ginipotitixit.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/92434341638.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/72369382914.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/35080051164.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4ee2609ca9ce7d18d73e9a30da6b1925/36066616049.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/3116780017.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/20b2482d7734ee8b114cfaae51637902/maralusodamuzo.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/muwigakenipejaduw.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/webitobosofakudegusok.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1615617ca25da0---97923700207.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/31749191247.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/78351684981.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2f4f455d4---72117574178.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/4399290630.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/37419272565.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/41880746606.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/pirexunovupekedidafovumej.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/23043711935.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/21301873362.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490fdaaf647---29830253000.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/vemosewafuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mage+leveling+classic+wowPDF 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_off0000b660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB660 17196 bytes
SHA-256: 778d1a7e2162e7184b24d1027b32f4eec8759ce58f5202e09514b6b16ff30186
font_01_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10352 bytes
SHA-256: ded9fe4441855c68aca37ed5743a3738d17a7971b377ada9283a5b1081fa8eab

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