Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9936cb872abd5e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 00:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9567aa7e0b9c27e60d9897b055c3e09a SHA-1: 820cff4fb94d0d0f5e0f735c6c8628341ff74c26 SHA-256: 8c9936cb872abd5e2a9a8e6e048c2b8f444224352101ea9339b2b9f233fdc681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

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 http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/beb16a9149a8ac81a871f7fd629fb7ef/77162297364.pdf In PDF document text
    • http://abpaluso.com/upload/file/2697657075.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/73334921023.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/dakumagu.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/neturaledaxisigawi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/285cce76f95d7af8a67cd0490e1f825d/mixezizaz.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/rejivexosuwonofebes.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/leniba.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b20e2a9abb5de67729e4c7abd3b856c3/8423842683.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/nukezanidavaxeka.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/56226609480.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e070d65d8d---17531097949.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11cadaa1d6---33739537212.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbe920cb1b---dilukulerifewix.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/juvogobig.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f47178bae96fefad5a237b92c7602794/ziwogevedujetupulagid.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/fametogojowozitixogitidef.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/76ae24079dee23377cdb9760052c3368/bideruvunepeve.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e574200f---jagofotizitasulodevewiwex.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a3f6d1dd---wedomezipubegajusot.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608faac78c775---47912102355.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/99862263203.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160713bb159462---resosuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bathroom+out+of+order+sign+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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 11052 bytes
SHA-256: ea5ed36ec2fefa5d765c0172db054c3db59a53a85e68710fe57ab862d73f596e
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 17816 bytes
SHA-256: f97cdf8487ba925be854de7a7933210c2d30633da2ecc0c8f9c75ea11e0f9a07
font_02_sfnt_off00012702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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