Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd54fa44e81f3a61…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 22:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3109bda1dab32c237f19ee6716ebefb4 SHA-1: ca02d22567390d822bb05754ae1d417be4054766 SHA-256: fd54fa44e81f3a61fd3ca976c72d88de8221ac8b25ac552bb1f9eb0648f93ae6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of these links strongly suggests the file's purpose is to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=777+games+apk+download PDF link annotation
    • http://rc-saty.cz/gais/image/file/8036310574.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abc76f6b2---87357944837.pdfIn PDF document text
    • http://djapm.com/userfiles/file/ziboperolifiselena.pdfIn PDF document text
    • https://campermagazine.tv/public/file/72422103771.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/87219736617.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pedufu.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/botanipobu.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/xobixavi.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210905_563C438186599CAC.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b686b8bc---jikuwoselemedekorod.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/nijulevolukonaz.pdfIn PDF document text
    • https://12shio1.com/contents/files/ditipifunanote.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b71eb07e65---pinona.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/nafodo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c107efc5---texuwavin.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/1802341143.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gutixawunuzer.pdfIn PDF document text
    • http://hkwwta.org/userfiles/45709599428.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/gibopomemitufonunen.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16145d79cb6076---34009698631.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/50688370926.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/617409114.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb573825b---31256873228.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/fuzomukenevowipomonejam.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/76377642226.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/nofosijuloxatigasomejiniz.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_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 10576 bytes
SHA-256: 3dec38010a0f2a9af36a7b2d5df7d370d345184b3d561ee4b8b0941e48b0faed
font_01_sfnt_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 17228 bytes
SHA-256: 8d45994cda1fc52feb41eb5261b51aede69720e4fd1dc328e5963355114c9f4e
font_02_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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