Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c6764d435bec2e…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 05:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 194a71c8bd4fb2826b6e160f1e7f4e2b SHA-1: f260c8a776685f6adb4292ca230d5ee0496fb8da SHA-256: 38c6764d435bec2ec94a81c55e6f48047d37d61a60b3e2c07ddd3dbd6fb69b1e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of multiple unknown URLs indicates potential for hosting malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nutrisoilvietnam.com/upload/files/remarutajizetelubi.pdf In PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/qjosgf7jvtt9f9g5fuaj7ek7f6/24192437198.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077aad641eb5---48791934266.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8702eda9c154583b3f0a563958deaea0/wagesijobekikop.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0d48b052cc91898ddc0bee911304b5b1/fiwevugunofovuko.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/jaruvuxemerulaga.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/33a515499fee662f0ea2b13d2bcebac2/45386196707.pdfIn PDF document text
    • http://millecolori.it/images/file/95604586054.pdfIn PDF document text
    • http://kingnature.ru/files/files/jonatodi.pdfIn PDF document text
    • https://wagaskar.com/media/82321719641.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/5466684167.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tudijodo.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/12576283767.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/qvr4vtd55mjrlujf9eeii69o0c/vabaloruxebavuwozekimo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/mlkitnpmkanpka9f8eglsebikn/21222025639.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2c51035d616939f7958251ce06f7d003/19150569799.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5655551c314e224ae8c7c27e4de22a38/zidezinixamewomalax.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/54377319143.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/salovitad.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/gujemebu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8656376cc9---mudavom.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608668de57e85---tamil.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/51087747933.pdfIn PDF document text
    • https://capecoralliving.com/media/file/dopularikefejibak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=example+of+parliamentary+form+of+governmentPDF 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_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 16600 bytes
SHA-256: 99daf42586352434a379d83dec77b208a4bc6da5ca1040ff694e974fc42bae19
font_01_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 10800 bytes
SHA-256: 39898cd50baf7c4ed8192a18a608df75b3cf8c03cc6e2ee8936fa625e2254ad6
font_02_sfnt_off000136de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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