Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad963c0924b99e8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 21:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f5798c9e915bc5e098f92c0028cfa74 SHA-1: ecd1d2713754510a5cd1266d35df294d2e15207d SHA-256: aad963c0924b99e848304cf808f3a852a15ed6b05c5e0292443871b33b6fe94c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://playerpress.com/ckfinder/userfiles/files/38417529693.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/34b9005bff266dd9e97f5dd011ab6fc7/63112999364.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/50646033494.pdfIn PDF document text
    • http://4bx.pl/public/file/suxekatuvaji.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132225287084---kavusolamal.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/8161814308.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/82002973525.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/feguta.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/leleruronipodaxabivep.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072caf9d2e3c---45485591650.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6ccf2dd6fa7821c97dcc96259f892d4e/letixavizozavirubimi.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/bajela.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc0aeee1aa---zixoranoko.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/63092758028.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/fobarakijubunefulo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hqafpfqi5qrnka6hh048ot3f47/51935043912.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/83185208181.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ce05e6508---simalaxefukedilekubej.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/84633902344.pdfIn PDF document text
    • https://luminex.pl/upload/file/mivagebukanusigo.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/potuwivemikepubug.pdfIn PDF document text
    • http://abc-tel.ru/data/File/50112602193.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/fipumoxurilurobasoz.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/suxezidetapizalimunimon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=composing+interactive+music+pdfPDF 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 19864 bytes
SHA-256: f741200a31b810f6c2c790178656c177e8dd6dc0375b4f4b8009882fc9b58903
font_01_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 11112 bytes
SHA-256: 5f5b0dc57df5fefa07e630bf5c1990cf02ecf2a5c9542ee4afc1aa8b34bcc972
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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