Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1187acf0ee927a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 23:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0e0b3967b50f0fec491cc100cf186c2 SHA-1: 6c6c2ad201f2c936947b2b9abc62b50dc9136b0d SHA-256: 0a1187acf0ee927ac68a5ca897e0ba898fd51fd7ef2844a6f2b22e93c54d335a
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://phrabat.net/UserFiles/File/2473813108.pdf In PDF document text
    • https://vestol.bg/files/file/gifazel.pdfIn PDF document text
    • http://fskyok.com//uploadfile/files/tegixurojuz.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c483d838500---85213829185.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd6604ea7---11207223164.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ffa0ad3d1---lotekiweziwoxukefew.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210521040734.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/wosixajap.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d575b65786---zefibi.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/46411077838.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/78976927679.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/dunuleru.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/vaneladirusazikum.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/22105063292.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/55026401614.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/goborag.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/17453554170.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/gaveluwi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/28915f0b8615e8cb02b5ed5e061079aa/57843009084.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723681c5104---gatikemakoweri.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16b60db2e---suribulumozuzuxubeborabud.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/kabaz.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b1560fdd7---21991019589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=irregular+verbs+past+simple+worksheets+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_off0000bdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB9 17232 bytes
SHA-256: 32a77964fe713748a0db4a262d0fd357e9bce2ec14de618adc13c71f1faa75e2
font_01_sfnt_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 11276 bytes
SHA-256: 33d13ac76339fa7c6efce2e5c50edc5f98fd3abde157c758adf6e59e4b546905
font_02_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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