Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9f0727b100cde1…

MALICIOUS

PDF

85.6 KB Created: 2021-07-24 16:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce7c89299e4de7be4a397889347528c3 SHA-1: e18f23293955f3d9030c1d2e898af32faca240fb SHA-256: fe9f0727b100cde1efd17fec0add4876cd8bea7f1530e55961b97cb44b0c1fae
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. The presence of a 'Password-protected archive handoff' heuristic, coupled with a 'Callback phishing phone lure', suggests a social engineering attempt to trick the user into downloading a password-protected file, likely to conceal a malicious payload. The document also contains numerous embedded URLs pointing to potentially compromised websites, indicating a link farm strategy to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://efficientinfocomm.com/ckfinder/userfiles/files/demafefiw.pdf In PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082b7b49434a---27091379448.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/godijotaludavo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/vinufixesedupupegur.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/3664690845.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/41162298612.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fu7gs2chb2tnv0nhlqjkh7pne3/70515845225.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405eeb2ad7---49595714150.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18ecf385a---vosuvavegijevemazeleto.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8d01beb3aefa26903bf965b0ace0b1bf/92115623354.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c91fb7b698---sukipafag.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/wanesipakugo.pdfIn PDF document text
    • https://brs.jo/userfiles/files/telavamitujix.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/poronobebuzapelomipewa.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31006cf9c3---57153211095.pdfIn PDF document text
    • https://defaico.com/d/files/budubakefixuta.pdfIn PDF document text
    • https://xistenze.com/files/files/97037850254.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/kunifonot.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/tujerukunokamiw.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/c0cg1uffh47j87a5nqce4hfor7/40318937612.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/palva00dhf56eo1mrq7464gj95/1040933504.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/tupirufunoxaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+pearson+access+codePDF 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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 17704 bytes
SHA-256: 30bcb877d6c1215e2ce6f9c60967f490adf440466153683d29c13cdbc64fd27f
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 10628 bytes
SHA-256: 570b3dddd9e08472a85b9cbf3804c8f138455f2ae97f8e5bb2ca1473910d0125

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