Malicious PDF — malware analysis report

Static analysis result for SHA-256 3399296762bf6805…

MALICIOUS

PDF

158.2 KB Created: 2021-07-05 09:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 39b3e2b2f241310dbf81934e5fdaf1c7 SHA-1: eee62d16c43a07b05a2baf2853860dbf563a9322 SHA-256: 3399296762bf6805ba6782fd9f49d874bab62d7a04f7d81db6821f989efe734d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or potentially disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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://crewmak.ru/uplcv?utm_term=ccr+looking+out+my+back+door+chords PDF link annotation
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/404f2d3a1068c2ad928f69592313c6b3/sirulefubufofopuju.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/9866073013.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076438f56c6e---rijujosalolikiwanazoso.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qcc90g0qrbi1etpd2njj63f0o7/ximapon.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/kobagaguxatufaf.pdfIn PDF document text
    • http://bociany.sk/media/file/lasizorezodazexamogejot.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c35a36e16ed---56102180489.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/zuxonimenibujuwudapebus.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4d71724a6f9eff7d0122a414c975307/dukepukolurepozegi.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075eafadb84a---18520684134.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/lizej.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f67f7f003---kovonidanema.pdfIn PDF document text
    • https://stvorki.ru/files/file/8559112210.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094a92b012f5---sidew.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87f267779---rinosopoforutose.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae01255997---17577092792.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/67029497162.pdfIn PDF document text
    • http://axwelindia.com/uploads/kipib.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/vikizokulebojuwo.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/34892020608.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dd07faf7d7a883a082a5c991d6cdffd/dupoxojimusavevenilibopis.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160951aac7c61b---jewadeteroma.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f14c20e52.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_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 113932 bytes
SHA-256: e9a8fa9e6173ce3bbd4d95006adadef0e67a2728c56e603d1c294fbec58fba2a
font_02_sfnt_off000224a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224A2 11164 bytes
SHA-256: 0a172ab8215c2d465e29c942b063bcb9ef308119ee56549fb1fb505c5a3320ec
font_03_sfnt_off00023e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E50 16772 bytes
SHA-256: ac568038c14c1714da3ce1f73add5592922fa86ec5548be48162efa647369529

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