Malicious PDF — malware analysis report

Static analysis result for SHA-256 948ca8356775ab05…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 16:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bdcaae0e5a7609d91c66d5952cd5593d SHA-1: 12b38c60b0e0352ab8143dd4e96053582a97b06e SHA-256: 948ca8356775ab05502a038c6e94c4e0ee558ce66fbf30dea377f1b4b253f71f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the presence of embedded URLs and the heuristic findings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/04b23cf739167bbedb94b47c32269ec2/6481284019.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607910b597a18---wazatup.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210814231536.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/95004725317.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/860ddfb1fab4390a0762017f847a1dee/31870362239.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/68728981643.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/giwamomizawefotogurowa.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/waneb.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lapadidisoz.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/44418478021.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021081404465573499.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210724_193533.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/gozelikekazimarubafuno.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/vsa9e43lrtfkapueppg75itksu/35994878631.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3b9rkshe0uolge57143kp5tnt5/85168185129.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/fazitamitaf.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/nuviwe.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076365db1234---luzemixo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81761a6c75---rofaxulixudozobila.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce6dedd3f---57663752417.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7623fe59b5---wojevorubo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5f1c422fb1acefad675f0f7428b6210/xejonubiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=terapia+holistica+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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 10576 bytes
SHA-256: 45dae3b21a1c9907000f4cf09a7edb75f8755f7fa70abf1a04e4d95a3a3092b3
font_01_sfnt_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 20252 bytes
SHA-256: fdecac18296a290a630e19d663ac21fbae0b9af7224be8bc4520598632fd94e4
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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