Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbf2dfa3aab4aca…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 14:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc02cca20d2784ff11cd03d9f9d61845 SHA-1: 4d21bb13fabda4179bb1d2e1175d4bb1a6560641 SHA-256: 9bbf2dfa3aab4acafddc54d3cfa10637a05bac4e2056daa2adfe39965f8b8433
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggests a phishing or scam attempt. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document prompts the user to call a phone number in a context designed to deceive, such as billing or security issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nomylo.ru/uplcv?utm_term=stick+shadow+mod PDF link annotation
    • http://oaklandscreche.ie/userfiles/files/refatisudikejozed.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/tumafugejimikasebizirug.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/pajaxigu.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/rowozizabifajenexadujimo.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/66039557557.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/zinolas.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a19a8b22---rotoje.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/84767069957.pdfIn PDF document text
    • http://cuiquji.net/d/files/6992209285.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/25332907106.pdfIn PDF document text
    • https://afma.pt/site/upload/file/45587217235.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/95954869576.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/derozisifivesovulig.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lawakumunodovirowasur.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/63290185477.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/45922516118.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/92568946598.pdfIn PDF document text
    • https://peterdegendt.be/file/wijexola.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9df2ae9b5---83672871308.pdfIn PDF document text
    • http://jucal.es/images/file/93830522901.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fdf96228c---pavuradata.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/xuxejidodila.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/wewuralogedogetikovifid.pdfIn PDF document text
    • 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_off0000d10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 16788 bytes
SHA-256: ec1e23818336ca667f2bcb9929a7d54535c9094e10f4f0a7f8146af8d769ae94
font_01_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 10508 bytes
SHA-256: 75929b210b62540d5e806195a340ee0c611f10101670cb063c209e690921f11b
font_02_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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