Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44ea8fcc8802825…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 14:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ddb1c7dc11abd6c1cdf8cc4b526d456 SHA-1: 272a2508b713b7e0d9d60ca0cbd2efb39fb3c097 SHA-256: a44ea8fcc8802825aafb998bf6bbc34de4fbb28d409762bb7984328ca12d3091
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607087b847cc8---47274123192.pdf In PDF document text
    • http://talleresjpg.es/img/file/92419620594.pdfIn PDF document text
    • http://tion.hu/upload/file/nanuduf.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14d4b16ead---jotebeluvikakeki.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/fijosirifemupopafise.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/durusolosupejilolipes.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d78c0783---82239973034.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/tusadefusoduko.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab32efa3ba1---zijofumiwes.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/31583708442.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c950a354f0---wanexorawawaro.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/68827008482.pdfIn PDF document text
    • https://andrejc.si/files/file/muxel.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/xagikafaseva.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/75121293649.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/37701193421.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/81617297490.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607de31ef0847---93887676291.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///gopibuwapitutukiduvenol.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/82197334552.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/tofulivelapopopa.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/wuzibizapujidamitupife.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/nixiluxusawewematowuroka.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b666f06374---23567967161.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/54181704734.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/51538448101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=practice+worksheet+quadratic+inequalities+answersPDF 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_off0000b680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB680 10892 bytes
SHA-256: 98669bdc1861133bcc04db43eb2443f5820ae0cdf40e643d61e63e5915389feb
font_01_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 14288 bytes
SHA-256: 4b665335ac613ed1881d945eea6a81e6222c4a2ecd009da3284f6c688a6746cd
font_02_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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