Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92b07cca34ea883…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 02:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 093b9fc4ce2de09a948e53c3c5c6ce45 SHA-1: bc160060676e7ac0af0a71960a73de0eaf3daa11 SHA-256: e92b07cca34ea883c52e530e2e699d6f32c81f1209eface3ddb26605076e6168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting. One URL is presented as a Google Play Store app update, suggesting a phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://bursac.net/userfiles/file/63483657262.pdf In PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/79335265015.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/pixevobefivajifuwe.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///tugexor.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210912_43F61770663096BB.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/golanelapifapulegexewa.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/fawubekeferumojuvokifuf.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/39091844814.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/88662151170.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/xolasadabufejuburaredateg.pdfIn PDF document text
    • https://phunhai.net/upload/files/9219924899.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/kalodenedupizamaposoku.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/46410447499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbb7be3a98---weretapobikofokaxapasop.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/dekorigizojajarexog.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ff75b85704f77816e3fa05cba3897b0b/68970743616.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/2346557.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613273461d86d---28232790911.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/47104985998.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/kodapizitotigotofofare.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/22306755790.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/85338552290.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/2831374932.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/roligosijefuvokujedunibem.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/suwerurosugiwajige.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/29533462052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=play+store+app+update+downloadPDF 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_off0000b51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 14888 bytes
SHA-256: 1b2f14e2a527d4434d01aa289e8171db947ca3470a60a45aefa0ff1800baa143
font_02_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10596 bytes
SHA-256: e77316289e357995863e1f9a40a09717a8d403453a96ebbe2983d034f021bb16

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