Malicious PDF — malware analysis report

Static analysis result for SHA-256 a900b29fd34f62ad…

MALICIOUS

PDF

86.8 KB Created: 2021-09-20 20:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e293c38717c93372f19abd2a87af06a SHA-1: 713ea250e37bcd1413ea729fd81dedc7688a9964 SHA-256: a900b29fd34f62ad7015915b0364f59dd6d6f71900cee8ef9f02aacf6250c47c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of these links and the PDF structure strongly suggest it's used as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161353e0499f82---35964967780.pdf In PDF document text
    • http://purepassion.pl/userfiles/file/bolesapoxavepatitogalafuf.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/tojawifezuxikulogaboduxe.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327234287d1---90532377640.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/fd8d0c454d8ac936076634e592cdd4f2/40827488561.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a3af472a3---nifudotinafone.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/webavevakasizina.pdfIn PDF document text
    • http://coolscape.info/images/files/nopijogakijitivowaja.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/94502036499.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395abebc3a3---61234960595.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/89622145516.pdfIn PDF document text
    • https://flomogroup.com/upload/files/21285076897.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/nedumonikapusetenexuz.pdfIn PDF document text
    • http://tiquital.com/documentos/file/jenasuzizenoxalumi.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/71901895447.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/luvib.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/94809328788.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/63578845516.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614583af3f272---98254176008.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/5283040474.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/jukaw.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/49985238225.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/61899396535.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/35834092820.pdfIn PDF document text
    • https://congchung7.vn/upload/file/54887031504.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219151436323611.pdfIn PDF document text
    • http://mastervin.ru/files/file/15784173510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+movie+john+wick+chapter+1PDF 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_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 11036 bytes
SHA-256: b837bc7ac5b7eebfd45ee6d49179f1080e506b230f91e174efbae4e468ceaa48
font_01_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B77 19020 bytes
SHA-256: c4bead38f784228af5890aac5857382cc8d2abf97b16860de4dc8ff36babb278

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