Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f411e5fdeec05b6…

MALICIOUS

PDF

83.0 KB Created: 2021-08-31 23:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 00d808351bb8a8f8ff2d6e53539c68ab SHA-1: 6c70322dad1f1ad895292dbd7af73b4061f9232b SHA-256: 0f411e5fdeec05b6257116f7884e1e82138467e4dcdc8ab69c576ae3a4a085e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these links suggests the document's primary purpose is to facilitate the download or redirection to further malicious stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad01dfa80---robisupidi.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be366ebeb65---ramilenabekowa.pdfIn PDF document text
    • https://morabia.fi/images/file/dedudenunubomufizowebov.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0a6f6d2bd8a3d088ba9eeebc27e8d41b/jefowuzorafo.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/91889865374.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608661d31750a---tuxoro.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/96004735542.pdfIn PDF document text
    • http://axwelindia.com/uploads/nepopimomigabofifan.pdfIn PDF document text
    • http://araonline.hu/uploads/file/56176529380.pdfIn PDF document text
    • http://damutech.kz/upload/2021/08files/210829195511363793l2ewy.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b9809baa---kobipoxusesekugorajuviz.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/905555b8a24bc38ea961acb205b7f266/43106066011.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/80705650079.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/oihq19d1jns72tf14u2os9ov4j/24648214384.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/63b188d6821175c315f8015314562994/99358143293.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/pidexabesen.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb18e61e693---jubobagotefivagozovusufod.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/91529802698.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/34147710496.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/98652194104.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/76778135316.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/jelijawexewinivu.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/77764791817.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c90c2cfa3---16240457961.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/gozewabajofunowog.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/dalamuwixereso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=difference+of+compound+and+mixturePDF 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_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 17300 bytes
SHA-256: 5e00c71b448a46c3b5b4bd1f66d855252c88b64c018e3bb0354c869cfff6e127
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 10768 bytes
SHA-256: 7e4b3087be1e713c44d715f008d1d897467fe922d7977675dc37e89a9e1d6e80
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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