Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cdbfb2f748d856…

MALICIOUS

PDF

108.4 KB Created: 2021-09-03 13:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f3d384e099343afaa33bfd8350ee680 SHA-1: e0153806bbbfd6351b469bdb1367d0891a25e553 SHA-256: 33cdbfb2f748d856f648c85c356420c5fa4ca021944f1a931e9b90b590988470
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and is identified as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content. The embedded JavaScript is likely responsible for initiating the download or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 7

  • 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.
  • 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 http://creativeindustries.ru/uploads/userfiles/file/62182626798.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7101a798---burogexakabiseku.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa7bc472c---vurorutirajorepusigega.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ebd573392---nanufarodalufuj.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5820a2baed---mijojilejowovu.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/gawev.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/govowomorikamepaputalebu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qj583p98fea9g2makipmg8jkaf/giresusepu.pdfIn PDF document text
    • http://gabortech.com/admin/file/25974126040.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noluzikekakukawinubob.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f57e87e40---26330754325.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/jezomodojamudukubuleto.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210813_302DEE5850DE4008.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160971ba022762---kufafiwiwetejomebozani.pdfIn PDF document text
    • http://kasargod.net/uploads/file/71632792477.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/10957540073.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/99ac0fcec218a848f97a7a088a506d52/zuwigalenonu.pdfIn PDF document text
    • http://beateromer.com/bilder/file/zevepedanu.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e95601cd3---3022593839.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/4acbd97772cc09d1d31fffc6b3137722/redubopabexobojadukiva.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/28118094058.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/52850270596.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6ddcba47ccba539e85e989dea68ead4a/zofexisegoroxajovum.pdfIn PDF document text
    • https://lesura.net/userfiles/file/15739325243.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610dedf840743---minoseromumiwidiliposaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=microeconomics+formulas+and+graphs+pdfPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/28112821109.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_off00013fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000157e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E9 11060 bytes
SHA-256: 423be0e383ad334c1d2c72e7ff5a157e36d77ee9a14eb9408ce8b5b7302c4465
font_02_sfnt_off00017136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17136 19024 bytes
SHA-256: 1d0237946adecd58a75353dceedd00357345659c35ef215e47f6200668d0e25e

Open this report in the interactive analyzer, or submit your own file for analysis.