Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae44edbaf85a01e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 02:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 460bb68a3b508840c0896365ccf1f649 SHA-1: 7da10c763e7e1a553c3b99b28ff833843dea9a56 SHA-256: aae44edbaf85a01ea862e25cdfbb3602bff9d68ebb25d488538330ab78e40252
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into clicking malicious links. The presence of multiple distinct hosts and the use of form upload plugin paths suggest an attempt to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/43941132d70f9ef3c5cbf5271247bd35/saropixas.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6fec039c6bab1cdac423a98370c0d093/bakefugokewofifire.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/batinatororovogexovove.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/fdf1c20a061cd5acf80dcdd7146648f0/rimixokosapasevidew.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/8697642567.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e217b36de---89008587202.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/8696735869.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe68df5c45e---dezaruwisiw.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/31047371604.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b3c3b087b8b96289549993f3be42fa13/35465505971.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/bifefifeg.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/degenejeweroku.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/87549488636.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/gijuxiwuje.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/lededizuvojev.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/zedatuwapukifakofog.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc7389f657---tetunixa.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xugidavoti.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/salexorov.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb74e98dd---wutarutaza.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/subogakozirux.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/cgmrd7llffuf4s2vttkuklkc8g/93526490609.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc602d8b0c6---suzizifozajolilamusegefem.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fac7779fe42---vedigu.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42641869671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=all+prefixes+in+english+pdfPDF 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_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 17828 bytes
SHA-256: 9e988283303e76616cd5353e7dd45cfe6b873c7ed42b7df81753d27cb2d25fcb
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 10480 bytes
SHA-256: a88e977a21de16a7f4c1bf7c3b3075c11c2a95c7bbad212fdf62b34d571681de
font_02_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1