Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d5fad1c0faeb36…

MALICIOUS

PDF

98.2 KB Created: 2021-09-13 15:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a60d2d011423bf233f61883a0521e07 SHA-1: 801823ff36c43214b44d65ba9ac8a14206ceba92 SHA-256: 38d5fad1c0faeb36a621715dbf5fa92ce2984927157ee304bf234d4065fa2788
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many links pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The presence of numerous unknown URLs further supports this, as they likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/n6v103of7qg9idd5v861sj7n5b/35875762639.pdf In PDF document text
    • https://ptogel2.com/contents/files/vaperopi.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16138d45adc5fc---fakavizofubemuliwaduxuruv.pdfIn PDF document text
    • http://imi.vc/upload/files/92931801423.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/zoregoxepav.pdfIn PDF document text
    • http://bamila.vn/luutru/files/wikag.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/kalarabafozajawaj.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/50247262571.pdfIn PDF document text
    • https://songhongresort.com/img/files/poxovema.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/3619936143.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mulilaxarubo.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/31611287718.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/85248776336.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/55873686400.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/28ho1vbnvbmpd84ojo0lvbuo7n/buvigefojiv.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/70012415289.pdfIn PDF document text
    • https://anfauglir.com/images/file/92948592942.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/64388386310.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/4177614377.pdfIn PDF document text
    • http://prograsifkalip.com/files/13302131659.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/57412365548.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161346c5c59798---dekonijijuwomanipagi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0430ab4bd---45363379322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+i+met+your+mother+season+5+torrentPDF link annotation
    • 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_off0001186e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 10752 bytes
SHA-256: b6e31dbb7309f24c18ffce14005a407c262d312126e6e55a8d6e71b2002b7aff
font_01_sfnt_off0001311a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001492c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492C 19180 bytes
SHA-256: a0ee827e9bae086cbba12bebeefc75de40f9115cfa0c0ffff931ffe8cbc9e929