Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74a259e8812c8c0…

MALICIOUS

PDF

78.9 KB Created: 2021-09-24 03:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acf1b7c4ebc70544b9d1f014dffb5001 SHA-1: 5b7e87408e2da60dcf1dc8fe81f60d231bbc6ebb SHA-256: c74a259e8812c8c06ed6bf8844a215d8cf14dee77628bbd83f068801c69eb8c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm patterns further supports this, indicating the PDF's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=no+manches+frida+full+movie
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/8lk5gtjp54kd1eonqs16sejasc/40256819777.pdf
    • https://theptaynam.vn/upload/files/49270610182.pdf
    • http://alompar.hu/uploads/content_files/files/26454350391.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614605275c9ca---malutibij.pdf
    • https://santa.sg/images/users/00000000/files/wiruvavudodenavodudomat.pdf
    • http://crabandclaw.com/uploads/files/nawepozijug.pdf
    • http://cbcom.eu/ressource/site-image/files/93158952943.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/lonoxufikamopetofewiwa.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eadade9d3e---tufimofutesukipasaf.pdf
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/90239595631.pdf
    • http://asbu.net/uploads/FCK_files/file/33404237061.pdf
    • http://oskarmak.com/userfiles/file/misudevonunurawepetumu.pdf
    • https://ehlibeytalimleri.com/resimler/files/zevikof.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/7dfc3d2df9410aa4807de541a688b542/50221320878.pdf
    • https://csp-pub.com/stockages/files/69971295831.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa2b7bc573---27204608562.pdf
    • http://bandbaajabarat.com/ci/userfiles/files/kalewexexapedavofovidajat.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/zutamemuw.pdf
    • http://namlinhchisapa.com/userfiles/image/file/giwurepozabeliposomevegaz.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bijup.pdf
    • http://jumpstart.mobi/userfiles/file/10344801208.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eda57adc05---misera.pdf
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/57511221993.pdf
    • http://mientrungland.net/uploads/image/files/nomupilasajasaxuno.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 16792 bytes
font_01_sfnt_off0000e699.bin
891c3dce0ec7aeaf579693f91d628efcc9c00cb8166ff8ffe7107987107d53b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 10788 bytes
font_02_sfnt_off0000ff36.bin
772ee8f0003858bb640dc99ddf48c5da3649c0cf03922319a13ee9dc7c580faa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 18088 bytes