Malicious PDF — malware analysis report

Static analysis result for SHA-256 473d4c48b53ee248…

MALICIOUS

PDF

84.1 KB Created: 2021-07-13 22:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2476e9bd5f2ebd4db7e24daabfcc4d0d SHA-1: d10f605e687e786ebab8c2c0608a929b7934ac6c SHA-256: 473d4c48b53ee2480a3fec3dd196360e9df1c01d52350d37f66d6eb27b9cecff
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or lead users to phishing sites. The presence of multiple external URIs and link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ddea9ce053d91fc0438c24c2be878ad3/funolowifis.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/861f359a24cb60af6248159d3fe85704/77524872186.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/gepusijexa.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/68975049258.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/71827177167.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6fc41947a5b58c67256459c80e91d36b/dasebilupuluberow.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/hmtg0soci2kdsjdbj2css7lnc4/peneluroxebumab.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d1dee2d4db---wufodo.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/53702620755.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb8e837825---49239083697.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/nevixuvomazaba.pdfIn PDF document text
    • http://www.toptehnik.si/images/palabadakugezemelemotu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0u9dm6tmc4jiqv6659lt10lvh0/podas.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/16318180887.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/vemigodokavodufojij.pdfIn PDF document text
    • https://subarini.ro/mm/file/kumadomokufobomivogo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d0a7c395bf89af4560a86e15df200374/mirebipivokarogatuwefimit.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/4446776787.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6qbn1pdkimca3tftoc39l5b430/13387140814.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/govaxobixebenebevexejuf.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8342b57161---zutesirokabegoluz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79af87b3a6---zosekogogerokuwagemeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=motivational+word+that+starts+with+mPDF 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_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 10528 bytes
SHA-256: a2632a4b20b7a3fb1bc20c7fbc49c4c60f7eae6d6eec4ae5d56a7292086b2bf7
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 17420 bytes
SHA-256: 49c4eb2292b8c02a5276723b3cf4458d8e3d43f71512e44bfd8b80c55ec83604
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.