Malicious PDF — malware analysis report

Static analysis result for SHA-256 6723144d40fb22ed…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 12:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2e84ed90ebacab5e57f7516b4b455c3 SHA-1: 493d70c9fa572a2591a0dbfc3bb0b0c2f6d85887 SHA-256: 6723144d40fb22edd75a4469a0b4f9a0d3a6c89f75fc58a3dcc9934681bee7fc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains or compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for potentially malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • 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://wastran.ru/uplcv?utm_term=memoji+on+android PDF link annotation
    • https://birotex.rs/images/files/87481357990.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/40378829459.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/dovetevipobi.pdfIn PDF document text
    • http://ingore.cn/upload/files/gopewanifoluxopamikumi.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/76527205282.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/dexej.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/97760350824.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e544e44a---89394464492.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/83612251535.pdfIn PDF document text
    • http://pmke.cz/pictures/files/83774783498.pdfIn PDF document text
    • https://path.mn/userfiles/files/balezuwejokowixi.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/wunubab.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/61244150941.pdfIn PDF document text
    • http://giga.sk/storage/file/201728391.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/74005614000.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/wenajinutijaside.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/1092083101.pdfIn PDF document text
    • https://foulardfotografando.it/file/76920344427.pdfIn PDF document text
    • http://baove247.org/upload/files/18117977498.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/2985366753.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429f6b452d3---60449213079.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/66165564971.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/48790772117.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/ledenapowunifeluzuseruja.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304b559765c---madov.pdfIn PDF document text
    • 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_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 17296 bytes
SHA-256: ca19c94bb0008beaf9c6b98e8cdf6c07f86169cbda2b96ac89fc5018146c2bbc
font_01_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 10220 bytes
SHA-256: 8f6544ee27f197b7d5f2611816b105383f0813e4fc0fca22331a4bc4e6059fdc
font_02_sfnt_off00012f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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