Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec44def9c10feacb…

MALICIOUS

PDF

89.1 KB Created: 2021-07-23 07:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fa34dcc86c02ea8efc8cf7fb4e00e87 SHA-1: fe9a55b32aac7928c1e0f38ba9e60ad474d871a3 SHA-256: ec44def9c10feacbf13f0a89cf15828e394ec2a8e0ca60892f88f1d30391d6c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of link farms pointing to compromised CMS upload storage and the 'Fake invoice / payment lure' heuristic indicate a phishing or social engineering attempt. The document likely exploits a vulnerability to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://piri-piri.pl/ckfinder/userfiles/files/98073695275.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c6dd151c6d0a4250be3fa7e101fee2dd/24746746253.pdfIn PDF document text
    • http://jucal.es/images/file/67477278484.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/bamun.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0111d18cecc1d27d403816aa3175cc66/jasepulagafepawunof.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160e6677b5a77f---54732276446.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9259dc2d---siraxidijutumidak.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/et8560l9u80tr8dblj5rmdnbh0/waxakagajebafasuwutiv.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/60200458986.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fb76794d9---batowedij.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/10198987181.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/vasikomamiselapebewojom.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5de3e7d70---29088348854.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfae9869e---13417891321.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/patiwagej.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/woxegigolezafeka.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a981aa1213209927bbd88b41362cee82/24149177826.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d047d2921---68432241484.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/74d850efca6b09801caba961d678062f/52494442728.pdfIn PDF document text
    • http://effektfilm.de/files/file/zivujebobilolegexifaj.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb29d6ac5f---27727758374.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ek82akhidd3n80dfh8i4oe320p/jeketafejalulufavujej.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255e5923eb---fuxejutogune.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/pusogokuzarosi.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/52626720749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+request+a+read+receiptPDF 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_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 10680 bytes
SHA-256: 4727720239f09e9cf0dd7439cb2a2916775726533a1ffcc61cc2a85456ff445c
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 16888 bytes
SHA-256: 1ab01a34231ed1651c670771148eb071ef7786f6e8798523038f8aba78a2a625
font_02_sfnt_off00013d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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