Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b7fffde160d55c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 21:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9f0d385604ac2952fcdd3cff972b715 SHA-1: 2c3f524e749d820d74f76e08a6da46d7a008d5c4 SHA-256: 13b7fffde160d55c3b49c6c58dc6cb1170b97516be9cfa03caec33344bebd138
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to direct users to malicious content. No scripts were extracted, but the overall structure and URI patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=mathematica+radians+to+degrees PDF link annotation
    • http://maychamsocda.vn/images/userfiles/file/wusakenujezatoma.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/88943356680.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/jenovesi.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/tumarugezozawumofosijul.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/20712105476.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/senudimev.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/3276295056.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/32776251915.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/63270738128.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041324354781.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/b5aagkmkd1b8rlppr8hgo3l1s0/kivojibep.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c707a4c10446fd8c3bbd85956c2cd2a4/38878671169.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/sobosuzoxino.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1e8f0d4f---judome.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16144718700d67---56489253603.pdfIn PDF document text
    • https://sentralperdana.com/file/gikuwafafuzoxanuzebogupiz.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/35681804724.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/54834707225.pdfPDF link annotation
    • https://ibericadearmerias.com/file/gijajafafuratifekegev.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/vonagekavotaxu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6702070ae---31110095384.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/dotajulapop.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/74319706201.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/sifobomasifogegawesofejik.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/vikilaperosokuxizinikuxa.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 10764 bytes
SHA-256: 7683ae0d8404a3b1e9586d26c712f59cbc6c4294036257ba38f500112b31a9ec
font_01_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 18152 bytes
SHA-256: c6aa86f088d615becb9413b486514285af28ecee468fa538e9bc35ff68b63e3f

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