Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ff47de58a25ec2…

MALICIOUS

PDF

100.8 KB Created: 2021-06-28 19:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3042b1811369a150471177f0a94c4ef6 SHA-1: 262f3a454f0b6c396492b2a3319817a0dd87c488 SHA-256: 97ff47de58a25ec27d1d5766465d4937e1c754aaa6ebb8115df472b57f37ccb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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 https://smidgel.ru/uplcv?utm_term=concept+of+heritability PDF link annotation
    • http://littlepearlbooks.in/data/eimages/file/wapupabipekubom.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/55792923432.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/7523792237.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a3c2b3cc---vevabumulisorivuvisabi.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8mhj971rvoc2n66sskbbt5hlc9/mafuwupiweg.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/777b619e3ede3e8bcdfa7e8f07a0765d/wilaxuzibanudedinupek.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6fa7419134527540993d2cd7d8327094/81307268067.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8945300baa4cac8a24af58192ba2e252/17570243026.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a811c11ed6---69349143419.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kj9jhmnbv1kejj9sdcefuskmcp/526310768.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf0918b8---dadimukojojitikonulep.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64583988537.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/96490261524.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b841ccc496c---13026411728.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/28687278274.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xamadufelakowa.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a824596e17---bafopinumujitananaperoza.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e052eda4bd---xenebitetatazuvodexite.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/irom98gdlni3ptei1vh915p2a3/54173190512.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/88867a910935df8fed537eda5a7659c5/dofarija.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608247ba68468---6374586477.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210620224438_kgiwgt.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5f8d95d50f948bd38d692536794ccccc/85996091804.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/16242009736.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210622_46BC2F36A0558D60.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a12bcc091---18198469676.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 17768 bytes
SHA-256: e7f346b6b3bf2f5dd9bcefbc0e765b8bccff8256e084e2a5395d2cb94a82d496
font_01_sfnt_off00013fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA3 16108 bytes
SHA-256: c89ee32484f924dd147b850a24a3beeefdb8a1d955e484275e9e38f3dfd593cd
font_02_sfnt_off000154e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E9 10692 bytes
SHA-256: 9fe43452141e962c7fc57145da11bd5ade34db4b2e6b01fa040965201073dc2b
font_03_sfnt_off00016d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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