Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d19a19a60dc71b…

MALICIOUS

PDF

77.2 KB Created: 2021-07-13 21:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d68b75c4be6b0a353d0d2a9a45103062 SHA-1: fad272252171d1b64e55ed7ccaefc572222aaaa3 SHA-256: c5d19a19a60dc71b52dfe0a9fac7af1488b590a698a64b95350ae87101a7c7bd
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, likely intended to distribute further malicious content or lead users to phishing pages. The heuristic 'SE_URGENCY_LURE' suggests the document may contain text designed to prompt immediate action, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://accesoriosalmayor.com/images/userfiles/file/91940815059.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f4a380403---fegepuxosizofowafak.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/98483727453.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a0bd0df6d1cb630b298e52d623b8ad8/zadukujugagukaneve.pdfIn PDF document text
    • http://teakdeck.pl/files/file/bafotigobugesajewepelow.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/e6vn8ge8hpds58pa9ekf9u5flv/92474355249.pdfIn PDF document text
    • https://agatanorek.com/files/file/linap.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/31885986838.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/p5grkak84a6ggg77c3pdvdtk60/bunesufipa.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a7e8582a---zevekefuxuzifowifilu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fee90b8b9a5b6d533d56d49d746b822f/biferetozopopujuv.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/xamozovuwisedewumesevus.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4hp00et0dj57i7t7sqt7eqbuhq/paparubigasifodegumav.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b91434ca---74349230105.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/joleribemovat.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210623062408839721z6drggmur2vh.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ff4499a0---gesurufenoz.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b0504728c46d2027db257c245806705f/zawuvokogixita.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc43d54e2---gerasu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607235d429034---48237724183.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/66046627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=essentials+of+medical+physiology+by+sembulingam+pdfPDF 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_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16856 bytes
SHA-256: 7f7bbc11d6192057fef591c2b4e23233831c08907677bd89d3de76cfc73fabdc
font_02_sfnt_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 11304 bytes
SHA-256: 875681c8d9bcb22c7565d898bf55104ad7178ada621a5364d31065a0a00774db

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