Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5be471437526b5…

MALICIOUS

PDF

178.6 KB Created: 2021-06-17 10:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2718ff0f318089cabff56726f4614541 SHA-1: 5cd3734f06e8cbb458f7d2b1d7caf2f7a85f6c9d SHA-256: cb5be471437526b52aea2172568d16eddb27e3f285dc475ae822cf27d0577a2c
156 Risk Score

Malware Insights

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

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 compromised websites and disposable hosting, likely to lure users into downloading further malware or engaging in phishing activities. The presence of external URIs and link farm heuristics strongly suggests this document is part of a broader malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://synerhu.ru/uplcv?utm_term=whatsapp+status+punjabi+lyrics PDF link annotation
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e8e7f55526d69ab7c29913a4dd6c1172/pozibotolifatuvex.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607975eca71a9---40646346795.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c157a927b7---48893430104.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7420c8a832---bawonafaxut.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/747d2bb0d399394da62b6e422ad10eb0/3434787956.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e8ea821a---59203758931.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/pulemiwizamosukidixo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50f53b7fa---wugavuso.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/8016502977.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/16075371178.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4lfffvt9h8utveivhothi53krh/rubonex.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e9ce9484d---dofaje.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88017b43f---jowuve.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/96275552831.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdee13a236---ziminiponatekodedato.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qu4jrp2lcnv2nv96cb7l9c9ten/91428715443.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/cc94fd1a7821993f45d6454092ab0daf/jupivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A4D 6872 bytes
SHA-256: 83c0ebbff9bb991cc93af282d813e07eff3498bf04ff53b0f9d0884f90a25908
font_01_sfnt_off0001aba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABA3 5352 bytes
SHA-256: 60778f5e6b41574bbd35d436082d3c1b0874b16fc5aa715c155fced09245445a
font_02_sfnt_off0001bde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDE2 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_03_sfnt_off0001c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C945 12824 bytes
SHA-256: 5ed106e76099babb692f4337cd08847b7fa83cd0b0bb4b4e46d5ed12a93905aa
font_04_sfnt_off0001ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED70 39984 bytes
SHA-256: 0e528b74f8f2d152c140972217ee3cedf7ae05691b17abc9af3c2190c5fad5b3
font_05_sfnt_off0002599b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2599B 11972 bytes
SHA-256: 87bf764d77fc12fdfb2a6502321d4803e146bbc13aadee3ad9090f7ccad9bc62
font_06_sfnt_off00028298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28298 29804 bytes
SHA-256: 8d4e6992f5091fc9100923c5c7801086085ad612357d8cf5ce7819d7a8c4aca1

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