Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c544c989d1b9577…

MALICIOUS

PDF

103.1 KB Created: 2021-07-01 00:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f4bccaa32453bbe8e326557d8bb4c0ae SHA-1: 3b29c8ee86271b59174dbaf49a1d42955ae0a840 SHA-256: 2c544c989d1b95772fb5e2c40348126b64d34192bfc67d4bf1e1a5bb780216c3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites hosting further PDF files. This suggests a link farm strategy designed to obscure the ultimate malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4f009401e---fisudofapejoba.pdf In PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/liguvemolukeg.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/57288146947.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ovt4quifdmban8o2m6048a972h/galigotiwipiridotujav.pdfIn PDF document text
    • http://short-story.ru/upload/file/pipadewadekejexinolinutep.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/pabovikitib.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc8d9e508---91737193973.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090404c2b549---foxuwegefofe.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160943f8b9d9a9---kokunanar.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/52d3jj7jneogednejt7a1vlia6/70000746176.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/melezep.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/nelotanezidinisisopilem.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7a3c1678---vudixinijufasemuguluma.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca92de3a92---3710193318.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d49e33e79c9---bufifivexoz.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/93473955479.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/57615084345.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea2573ef9c---49969367320.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/28681240612.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d72c4042---kevowajujibuluxunun.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e00dedd8f---kixalosazexutopaxabanu.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/lelusiwunid.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a8e2bb78---gosabadagurutizisamafa.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092668b509ad---18816439461.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/bdce37ac74b392e4d4eae43e8e9ee87f/83472859385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=currant+jelly+stool+infantPDF 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_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 17960 bytes
SHA-256: 265bae1ba95f14e1e94a93eea0d6c3962070f2f27eb01a6f787aaca2a764fd05
font_01_sfnt_off00015ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000176ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EE 10584 bytes
SHA-256: 8d9a273e91a3b39df0e4216cfa505563e84e5bb4b8d4546ce10e6785c34f42d5

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