Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb76457101822ddd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 19:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a8608188bfd1234739590723bd6d5de2 SHA-1: 174775ea48c4fd0a31393986df86485afcace77f SHA-256: eb76457101822ddda2af92a27a5472626cdb50bb83b19ed049b29942c0f60fbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly support its malicious nature. The presence of embedded URLs and the link farm structure suggest an attempt to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://priscar.com/documents/files/21152942959.pdf In PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/42265164388.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/tuvotasurosipoma.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/26702902672.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/61674934028.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/natal.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/firekosufozusudojagu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mmigpioq9u0g3ghiogp9a2tnhq/bajuteruzopaji.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/71017748179.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/kazebojanesela.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/jetat.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/tefagodamiteje.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/kiwofolazawozapo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ae9672208d9c5821454b14754ae09591/81548552063.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/53883987304.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/notomegonovegeli.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/17262406370.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kafezelamixunezitut.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/mupuxeviv.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/levuruwikufon.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ucmqg2ahsj2fu21k3dquamp5ph/zuwasugerawupavujosola.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/88959527802.pdfIn PDF document text
    • https://curvy.tw/upload/files/58287562389.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/51484501774.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/jowogofodukejifibi.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/gekuxerafopidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+lara+croft+relic+runPDF 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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 18064 bytes
SHA-256: 8f61bd554cab95463cfc419f6d52a37409d75d198581f090cee738e88bf4207c
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 10488 bytes
SHA-256: 0850d2b8f9bce5e8621fbf27df252f6dd513c1bbdb2c0c9a131129cab1c2ddd1
font_02_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1