Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed39cc366ed58e2…

MALICIOUS

PDF

74.5 KB Created: 2021-09-20 07:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee6c35269bc59ef8422c0be229374d83 SHA-1: f5163988f4cc50eed86065a1e43c01aa97549e80 SHA-256: 1ed39cc366ed58e280d7ad4763fc0e6e887983a9d9d468824eca361dc2cfc7eb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137fafc839d4---88699409311.pdf In PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/kosonisawopuromanuwumop.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/dobukisesakorotetini.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135acfda0d7f---xezuwufagepus.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/laliraxadowutumorifu.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/lepepezosurutefovuvuxugo.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/sejokiwurovog.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/24525441889.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb1361ec42---87287306406.pdfIn PDF document text
    • http://theponghop.com/upload/files/89253203298.pdfIn PDF document text
    • http://progetec.org/userfiles/files/sutezukatovowikumo.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091114063773499.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/83872741456.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/fukojawuwulokigole.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/45709355736.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210908142713376.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/tatinixaveribini.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5447341840.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/83019482394.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/rizexavitimonesu.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161354d583287e---reronufesugisevuxoxet.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/21067061030.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/pefetasuromonipof.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/86927090562.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/fosanunipubi.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/38119592709.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/gevipew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+design+of+everyday+things+don+norman+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_off0000bf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF37 11040 bytes
SHA-256: 195af01b64e05ad83f9c1a89a287de73cb562e9f18a898b0601f402e1d82d89d
font_01_sfnt_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 16724 bytes
SHA-256: ca7aca71182affb6e395391ce2a15ab8e12c0a3ac692c29bc7d823b5b0d138b1
font_02_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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