Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe6127617972d46…

MALICIOUS

PDF

100.8 KB Created: 2021-07-03 15:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc203d20caa704a6370c097f42dacf1a SHA-1: 5866bf9886afb861052bc090809fa7eeb52a2da3 SHA-256: 4fe6127617972d468b53b1e8ef85852a52b1a9390aaf16907bb8ef362c54923e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 6

  • 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.
  • 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://maihome.hu/admin1/file/41197287443.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/apfk4m7gkree2r3ipmpsdlljeq/24459592679.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/91b66f00e74c230da8771df82e6cf0f2/84548112912.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/0f72fce4cd191333ac136d9cdba7660c/naketipazimulakimewabofe.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/fac23d6045f504b886063824224dc19a/22723163996.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27f52ea806---tawapojuvavoxe.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zonojaruzive.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087d438d9cc7---99628191107.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/d8d9c05c164deb1e426742d8cd72096f/87167993589.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/jenezisexokajamodusigobes.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/gebidon.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/42172692237.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jbg84r0pq5p568otj84da86pm0/naroxexekogasotosafuri.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/419daf3eb4f241e7a143c04cae175993/bozizunan.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e59bc74a---razek.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f727a1c5b1---wukakom.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/lenuduvezur.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8c64efaabb92e66213c9ad96f22bc0b3/vufalijezewipozere.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc2325183---10015173211.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/32812354402.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b0a022f339890ef0c07ac248c2509b9a/4880780119.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/2a8ed4bb67ba045b5e1e287e7a706aa1/mexuvekukiritazuzi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ek7junkar3jrruqq0b4eaimri5/fuvejemazozawogekara.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b056802210e915cbd4b0023270151df9/fetebagipafojo.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/nenenidexeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ps4+disk+drive+not+workingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 10540 bytes
SHA-256: 9392b18c02733dedfde79eafe307b93555715cf122a9b66b15824dd3290251ef
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 17284 bytes
SHA-256: c750f6a71273555049b34e48527a3f3dc889cc89fb7cd7630a3730cd3ad37e6f
font_02_sfnt_off00013e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0E 17872 bytes
SHA-256: a0e04ee0061f497a7d07a1e65ca840a21acacd88642b2b8a51178901935ad1b0
font_03_sfnt_off00016d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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