Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7774db5ae4ec0fd…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 03:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c32b5a4e1617ff6c24774df6884c579b SHA-1: 1a8dcc8f87797d58035d398d7466240b3e498965 SHA-256: c7774db5ae4ec0fd9fe0f38040d3fd6d94894fbe739320860b1f5a792026d71e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to lure victims to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://akinmedical.com/uploads/file/34391588733.pdf In PDF document text
    • http://focostrade.com/files/20210623205812.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/672e125efcf8fe9cd17deb3c3b977eb4/67747443500.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/53756398888.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/38800444987.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6b577e25---85824763476.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/lofetufasetuzimebo.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/97099779537.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/44309500993.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/tepog.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/766b3e6274bbdbb7399fdd1ad22fd01d.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f1f0187a---vexugezijewerakuvufer.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/10670269557.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/23294392526.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/81728100137.pdfIn PDF document text
    • http://sbcnepal.com/images/file/dupaxozanuwamimaludufeton.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/45hj7l8tm67e4gims9ci7tqdd4/43021466599.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077286d76dd0---najilomiroj.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a9125d1c173cb0e2e7b39d21b01e5cfc/74810502303.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/xiwidexuxupezozagewirej.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejoz.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/l4c9oarmvr9mmllaij5orlefc1/darawipava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=problemas+resueltos+ecuaciones+de+segundo+grado+pdfPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/kovibawejabazixafolikaf.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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 21692 bytes
SHA-256: 7fa0b55690d5d5ac5a0663a082d9d4c070c24ee1ab2c7abc6371009ecfdff20a
font_01_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 11204 bytes
SHA-256: d4aa5923f4e89a7461f513f43ecba63eaf4563ab68f9c03a8ca4d8e6336b66ed
font_02_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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