Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbe1d9183b3380a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 01:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1f9b47ca3422e3e80ccb9dfdcbdd324 SHA-1: 88fe3b6820967458f024f93ea56971917934fe9b SHA-256: 2cbe1d9183b3380ac520076c367a6b40e94244a1a5eebc91961188d27507ec72
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or credential harvesting campaign. The presence of multiple links to external PDFs suggests an attempt to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://unicorn-furnitures.com/d/files/jofosojivanupedu.pdf In PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/98304301171.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9469a6a61---seximi.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/80734621994.pdfIn PDF document text
    • https://preciseenergygroup.com/media/nuwaxitiwuzozoxenel.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/g0me0uehlch05r3pla2u9jlj7p/88404335195.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/pudogoralizunetedorapox.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b3268615a0049af7cd8f7667948e2a84/famevusenibotob.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130027b1a1f0---ziviludarexinubetapubip.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/bodigesegugixudademi.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/43309000370.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/14953000132.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/46441318297.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/g9egoduc18fd8hgnit42ribmg7/50028727018.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210908191050.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/68261185764.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/gamorirefilefew.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70561270185.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/89168336290.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/buliwuwetexabovan.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/pikupatapabaferen.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/vixanetivatutabopi.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/vivujapovufuxisakagojav.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/gudelonujomerilunaka.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4ed5adea8205da9c3a30cfdddf1d682d/tegiwirigibob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+qr+reader+appPDF 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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10220 bytes
SHA-256: d5a616a8829a50c7ba9466ebb48b57cd42e886519e8d7eb1a89ff630c809362d
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 18136 bytes
SHA-256: 810120632ff1dd7b9c31f633241fe6d0ae6544fa96f136d247da1c8b97a56cb4
font_02_sfnt_off000130ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1