Malicious PDF — malware analysis report

Static analysis result for SHA-256 5547d7e6eac5ba89…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 21:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5dd1e73f6ba888d3e7fd57194eb6c066 SHA-1: 1df7bed8b23187966fdccd572f2d534ce919ce9c SHA-256: 5547d7e6eac5ba890f42a09b185845e02a6823c39369a80607d45c5af8085609
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rafaelstore.ru/upload/files/zopigimerusafewepawaxukow.pdf In PDF document text
    • http://timandlor.com/userfiles/file/dijakalumejibusadaver.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720e958e519---boletelijesopibevivi.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/32605434879.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/jjg6pb5cf7tnkedismn91ptob4/jirofovuzijaluwiwofop.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923f4e36ac5---tafikijumomu.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/gabunagib.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/fugegimin.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1c231a66c4dffa99c357fc31264bdc80/83487424349.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/fedifosivonatogavudedod.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021072921550073499.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/13849035144.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/mozajisujagoviludoret.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e3abd2dfb6ccf6d0f605d5cc3ac35902/kowesekalob.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/4684876515.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f89e4481ce5---xabixik.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/zivunefogewosub.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/43769733840.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe00eaf8e---59751051013.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9badafe4d3b621032644fe31516bd513/rulovelixitosudobiwapu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160862b6e4d281---8291244517.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097f25f4ed24---bixukesadezowi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/aq6mvb2231p4dk80tj7628nu99/lulejojan.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/wepumexogegujonixisax.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/fovurife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=principles+of+environmental+science+inquiry+and+applications+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_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 17752 bytes
SHA-256: b6118ae69a0f00af821a27061ab696bb6667fd7848d8f6e9c47e9ec440d8672c
font_02_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 11208 bytes
SHA-256: 66f60a06b86ce9a82fc36d1ec770e5ad882d025e8bd98ff6f581c1577b610dfa