Malicious PDF — malware analysis report

Static analysis result for SHA-256 edee51db5e2a5421…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 04:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7ec85d78f75006145326fccc8f66026 SHA-1: e884388a6f268748e670b0c9cd87fa8130fd7809 SHA-256: edee51db5e2a5421f0a14d4390085cf22cd310730ca4bc4e6645f45064d4ad1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.serwkom.pl/plugins/ckfinder/userfiles/files/degujagapasavumesujudu.pdf In PDF document text
    • http://thecountryclub32055.com/userimages/lerefaxinipinobojo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/coce7p3stj5qkf7ge1dcjo8gaa/77701792793.pdfIn PDF document text
    • https://badoza.net/userfiles/file/82513353742.pdfIn PDF document text
    • http://ailizia.com/userfiles/43468363564.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6mnuqfofpnbt0jmsdbt4ou01qt/94766374845.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667420b7ed---tozitebenoza.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0a55301712cfa8a54896b656d42258a3/reximofezalotusakupop.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210907041325_b5yn2o.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/xejodavepivadodokerak.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e433d014b3---33755709637.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109131819092901.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/kudijimiridoritipog.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/45143713892.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/35705952101.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/23f16e2af85fb301541a8f9630a5a42d/87879027144.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8f8c37dc8ccb680cfa1968f6eb278dd9/rebezepodekoboj.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd8c539a3---30611728047.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/42810491387.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/47049315295.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/bezekamox.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/gimuxijefagasorisor.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/62090268397.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_000459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+save+music+on+android+phonePDF 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_off0000bb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB58 16944 bytes
SHA-256: 44f9c60c1a6e4790ceeeb936e32b764dec47dd59c2b68731fa0db275b9600aa1
font_01_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 10976 bytes
SHA-256: 6effa74c42c15e8a334c60c053dc18b5b8e14d0b5e2183b6b16a754ff49a9b62