Malicious PDF — malware analysis report

Static analysis result for SHA-256 79eb64ee7d3828dc…

MALICIOUS

PDF

108.3 KB Created: 2021-07-16 22:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4de7cfc0ad59fae68da4756313e1b6ac SHA-1: f8b6237167a6370d229dda372b08c843be320c4d SHA-256: 79eb64ee7d3828dc2b37abcb50298a5278d78f4cbc812c49f6ffd018ee40e4a0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://au-coeur-du-temps.com/userfiles/file/xutediweruduxul.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813be3b0f6f---50783400714.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f11a0a13---11064781978.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a91a1d0b---tixuvenuvuguxawekavekemil.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/29433470226.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/28119557005.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/1705525886.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/3182eef3f038d5e55757d6f5843e398e/joburegexoxiwefurow.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52238044076.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/92915283839.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/lrvta5n76vpb3ghn4ufohsqv03/kobozajivafajunil.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/4690c5ffb117eeb6fbf300c4156065ce/mazuke.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/sipiforuwukarutu.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/21984271464.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/91663426170.pdfIn PDF document text
    • http://regcureguide.com/files/files/57592535614.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc9fa02803---kuzozufalazotazuxumep.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec53fa94d7---malazunobajodomup.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075793ed471f---palufowifoxuwegusuz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e036fbc318b---90363724191.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4304dff19---26938927570.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160888ae3d8265---38188320857.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bbb298db19043d45548b7bb1e494a47c/pibezawegarimazunufemakib.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/balozu.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210616143809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=film+korea+that+winter+the+wind+blows+sub+indoPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E77 17400 bytes
SHA-256: b496d40df435d252888fd0f99f23f6d0b37328aab40f9e66b372ccfd7b3f815e
font_01_sfnt_off00014c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001642b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642B 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
font_03_sfnt_off00017a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A4F 3248 bytes
SHA-256: 509a0cab059dc370f3fc44859010b732f768295be7f8ff1035cd1f98dce62f60
font_04_sfnt_off000187c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C3 10908 bytes
SHA-256: 4b0e62d0bf8e78d90ac8920aab79ca1411c1f568774f73c26c254cee0fa27172

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