Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2057274d2e8ba65…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 16:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b6cd6740368b2cf4d345988b6634d70 SHA-1: f3edaff981b5bdf4cc3b91e8f360568325ee9b98 SHA-256: c2057274d2e8ba6555f5b665fbc2a05935ecf8e9bf748d6b56c96b8f9e31fef1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, likely to distribute further malware or conduct phishing attacks. The document body is heavily obfuscated and contains no readable content, suggesting it is designed purely to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cructi.ru/uplcv?utm_term=verbatim+power+bank+10400mah+manual PDF link annotation
    • https://wemservice.com/ckfinder/userfiles/files/26302128460.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/mamimiwemepotatanomek.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e63e6e57f3c---23202327067.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a952be866---fokutof.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/jexemibakubavagugum.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611b85a6c8cf4---19789071731.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/16941500743.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c597444fdd0e36f69a2fbc6203898850/99482976210.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/xisowere.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab47bd23dc2---jarupawemikepenubuzaki.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/gikev.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8793f7d779---36034974048.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/losadidizedisebewupasu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6199779e99dad93843f890130d7199bf/sugimol.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6174b0150---bobavigukufewupabonelis.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eafeb6e5e2---kutifesaxufozidam.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608024ddd0f9a---58151745635.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gegalusatapifirasuzinusal.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/wibawu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4aece028b5a85b685aee6907f6e8f8f9/zamunelitizepudowofoxa.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/12432207063.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/sunasujetegi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607effdbc12e2---33407464319.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/zuruligizutidenexi.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5ad3b980f908ec57def2ce5314af0074/mutidukixuti.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/bufapizezatafotebuzarelup.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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 10988 bytes
SHA-256: 3ab064aef2a5c9b806b62962c5f564744f9ce4cd4e370a886f98a8d9dcaefec8
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 17624 bytes
SHA-256: cfbfddcaff05f467b0cacb5dc4ddb45cdbb9552613b2024ae5f24c43f732bcab
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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