Malicious PDF — malware analysis report

Static analysis result for SHA-256 079602449e3d94df…

MALICIOUS

PDF

86.8 KB Created: 2021-07-15 10:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bc78762d83899c19c744641c792b784f SHA-1: bf34f9bbff69803fdefe43c9ab0d57c39738bd80 SHA-256: 079602449e3d94dfc2da87aa45df7a7ac97f64115b912b4f666bef024760c589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm to distribute further malware or phishing content. The embedded URLs and the heuristic findings of 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://smidgel.ru/uplcv?utm_term=request+letter+format+for+school PDF link annotation
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9976f3802---95470141235.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/zominitofonipemukisu.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/6posln82cg6tmad690di5almd3/wuvifuxibavewuwi.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/setisazilasamafesa.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210507140724_1078468819.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///xogirotugoluxifijovonaj.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/11088545634.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab053a770---41953159611.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021662138145569.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/94949779011.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7da269d34e683b0a1febe1d574d74ecd/nekowef.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/95607213967.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d6c9a13c---vaguxubitirumoxib.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9152f699ee93071303af4d5a3cdc0b64/93929031358.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/74739300152.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c7ae0121d---fujaxo.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/3202582979.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a5abf35c86a43647657d6ee2d5392754/75935523655.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4kuidoor1u9sl22j5mhk6vs067/xolodujalagaloked.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838abae4024---sizosemu.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/popupenivedagisarodi.pdfIn PDF document text
    • https://manenshop.com/upload/files/zugapekatu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/33925983140.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099367c85a44---saxovelo.pdfIn PDF document text
    • https://angkalaris.com/contents//files/62906188870.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e92409865---69746548797.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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 17260 bytes
SHA-256: 85f806adce53d31f32f5ae414164c9549cb322db78c6287b1f5164bd1997d3dd
font_01_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F8 10696 bytes
SHA-256: 13293d09d483fcef20d0429805cea90b4a675132398eea9bde59d6329231a320

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