Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf3b348d2fd5267…

MALICIOUS

PDF

90.0 KB Created: 2021-07-27 03:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7f82d06e8444d7f87308abecce9f728 SHA-1: b64f5c6a5a27f9bfe9f8431ff217c402acfe40ad SHA-256: adf3b348d2fd526749c0dfee57163faeb397077ac98be1b55ec5a9510f0c9565
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to numerous external PDF files, many hosted on compromised CMS uploads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a likely attempt to manipulate search engine rankings or distribute malicious payloads through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://deryalvincotokurtarma.com/userfiles/file/lejukiliram.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/41b0f05e1e600c019ef5c2d34a6e3dd8/ruvozaxoves.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ec628948---fiweritip.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c324e5ee517---21992649237.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/58834316783.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/45672497386.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4c94afd05---65927723250.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19836815892.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/08cc3918cd0d646c91ef57cc967b096a/90560053493.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e9c5ce760396946e5e1c2603bd895d3b/wulifidabikibara.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/da9gl8qk9ul7kolab3pca5a3n2/52311364534.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/japaripiwoxa.pdfIn PDF document text
    • http://cissi.it/userfiles/files/1906490808.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/90798300561.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d0bd07407---5293147042.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a995392c5---dezumerarorijelebevetowi.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/xezigumabikitas.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/45611961362.pdfIn PDF document text
    • https://energooptima.hu/upload/File/xemisegeneroma.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/37437760386.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/41457550201.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/zawaboludukurusedama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wild+geese+mary+oliver+mla+citationPDF 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_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 10888 bytes
SHA-256: 0ed85407883e7b07ebb165b851d46e698b1824e96040720002490996b2353573
font_01_sfnt_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 17144 bytes
SHA-256: 48c32e0c639c592310c0d45155c8274059b4743f3ea6df8ffebd26dd86658b6c
font_02_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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