Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c355d68c52e79d…

MALICIOUS

PDF

82.4 KB Created: 2021-08-18 12:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 352a3d73e1cdfd29adf571b651f800d0 SHA-1: 73308f93c73fe3619420704d3ffaf429e84f02ec SHA-256: 79c355d68c52e79df9418509b5664fabd350f5e44b5b86a73375b36ae8dbc160
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e89a6f747daf69c2360d2b70951e31dc/pinironeti.pdf In PDF document text
    • https://topclassgreenery.nl/images/file/70404027491.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/39778166639.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/winuxiwobasavewim.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/50732609617.pdfIn PDF document text
    • http://mayjack.com/upload/files/99957770316.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad3247c6f---razinagugi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/18d6579694027385bba425d8ce360701/20319671128.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089795f2e853---dojusavada.pdfIn PDF document text
    • https://brakos.it/file/12418949546.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3e5cc398---vekepaxotisitonirug.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7a714e8f---fudidodonowuzizejam.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/sabodemejive.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/sexiwebesakotadivowomo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608a12060528e---soxisifa.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/kebitona.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/15198877245.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e54077ebb3c---20551267353.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e9fb04d5310ca737bda67516df938f17/kepej.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/kiguwepugupilufus.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103d86193805---46429878607.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d1dd7e73---3963281738.pdfIn PDF document text
    • http://huiking.cn/uploads/file/141845427102.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/tosamunavamesulugelovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=impact+grade+11+cevap+anahtar%C4%B1+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 1848 bytes
SHA-256: f81fca928dd5d059a9d1f296df24117236491087919f0ec26db7191ba906cb6c
font_01_sfnt_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 10756 bytes
SHA-256: 78990d6ccb2c0acf602f6fc1e19b4437662343adedebe069b592d5192527d6fd
font_02_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 18516 bytes
SHA-256: d029f19463ed71a4301f0cdcec780515d6c013b8cfe0df885d7e162ab6f923c5

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