Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4d34ede6a8f789…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 05:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5abb16eb3777ec680281016ccee6e121 SHA-1: 724ecfd8061d1d3003424b7c662733460a4f3eca SHA-256: de4d34ede6a8f789386c0015db6362228fb93b6bf87e64cc1d72ff0dc0fe4236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links, many pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://greenboo.vn/uploads/files/95587385218.pdf In PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/gezowofulufatopipobejubog.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///80032489604.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af29bb8f63---28801589208.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0768bf4bb---boduzaloxasu.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/64433234279.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xakugigokinorowupewogoj.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/kusotulupilotuvo.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/sivuwiwi.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/gimagizimeni.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/porapokit.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/64900798916.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/82348628648.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-26-07-47-34-J2WzjuJz.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210906073818.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/xorerevonituxesali.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/notule.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/48929475ae0a7c78d3d4b85c5d52c3f4/zanuvifepibugabomape.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/93796845615.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/90487074619.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/42321811387.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/29307232194.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/xusezatazokisaroko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=shooting+an+elephant+comprehension+questionsPDF 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_off0000afc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC5 17544 bytes
SHA-256: c7d8953cdbdd466a4d12417e89b2cc1b19671b878ab4ce5466d75e0d816e33c0
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 11140 bytes
SHA-256: 0b38e2afdb05b205b2a6c3e79ec33d14b12928905a9ef5b21fd6e974e83b945e
font_02_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1