Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b48e2d8112d3c0…

MALICIOUS

PDF

91.1 KB Created: 2021-07-31 15:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6abcfeaa45e8723ddfc7ecc315104383 SHA-1: 2e59cfeb2df520dab36d77cf20ef1892d4d72201 SHA-256: 81b48e2d8112d3c0c28be1f572ebb91d4996d3efec63e98edbf835e2c93a17f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a8ba2a67e---pekapalexanite.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e593ff32710---sagoripalaxir.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/bukujikonajokelopig.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074742da2b03---70995992155.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9a88u26vo8iaj0nla8oi59kitt/29206090026.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/396a8a14021f2cf306411e3eaa173f11/nudimawelupaxijojana.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5206997ed---87074314486.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/1a2cbkakoi07337ifkj3dk8a79/zegubafabovusodexifata.pdfIn PDF document text
    • http://imi.vc/upload/files/10337190233.pdfIn PDF document text
    • https://dacola.com/upload/files/wajilepitunopodokifusisim.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/594e523fadb1662c74bb5a125a4582e0/59550787502.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b344e1ee089---63025642375.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/jexosaku.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/wedoluxematavovej.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/44726598998.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/92262944593.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/toreravanoxexi.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/jizizoge.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afebedb1c17---vovavij.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/38153280939.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/12298624339.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/xazedisu.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/11057698173.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1060ef2ef7---77091328994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=quick+shortcut+maker+2.4+0+apk+mirrorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 11128 bytes
SHA-256: 4060df55bb771e7b394ba4627259a537ace00795676fce5d9abf19dad12be6e5
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 3028 bytes
SHA-256: bc9f85b70f7f8af01038cd94ab986e5f8485639740a883be8949b36eeed7cc9d
font_03_sfnt_off00012b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 19300 bytes
SHA-256: caf37a4245336e915a06043a05b752855f266bf9c99a7853142d817a5819f71d