Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbf36a56e6a0903…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 15:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba1bd0a5d032ec225e9170041213d5e0 SHA-1: 71a76dbc8599fdda99e2070e55d2c02861ed434a SHA-256: fbbf36a56e6a090344c55721afd32f4c77ec203709bf48ce106bbc736f0b34ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The document body is heavily obfuscated, but heuristics indicate it is a link farm and a callback phishing lure, likely attempting to direct users to malicious sites or solicit phone calls. No scripts were extracted, but the presence of multiple embedded URLs and the nature of the heuristics suggest an attempt to exploit user trust for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gsm.company/ckfinder/userfiles/files/61207119083.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rruffahscru03ptob6kdfubn4v/miremeg.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109122013559611.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/mofer.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nerovimuforukeniwasewux.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210918055608424.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8t4jcm0mkk10si1vjgj9c8i3ja/monokoritowidofola.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fiwugoki.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/pifuxebipiruvotosarom.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/56354523329.pdfIn PDF document text
    • https://thietbigas.net/media/files/15847636555.pdfIn PDF document text
    • http://erictex.com/ufiles/files/56951449679.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/20988389693.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/luluwedafezapeturaj.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/wosukemofozesifed.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/vovisativedekowop.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/detipa.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2b6c63cb---rulozemekixorori.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/f7dicdh3jq76mme1hf05iea56r/jilalixawi.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/mipugidaweroparad.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/45444890065.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/65039851474.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/xojefozixuzogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=counting+numbers+million+billion+trillionPDF 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_off0000b3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 10560 bytes
SHA-256: cd14625c02dd8bab9f00faabdba9b09fd10a74e88052fc8d26da892be1f59162
font_02_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 15940 bytes
SHA-256: 3dcfa29e04af589d14742b711d71974e79a28d63b868781fac28bbc92a022078

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