Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5806a7c9548c255…

MALICIOUS

PDF

112.3 KB Created: 2021-07-03 15:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce2670b206168f38d38ed15e01e0be54 SHA-1: 38a81bcae3efb9ff45e1dc461938bf2392540d15 SHA-256: a5806a7c9548c255a687f6002deb70d7b59f1c7e89f6246ccf7bdd9f76b9f7dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The document body was unreadable, but the heuristics strongly indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0h8g1vf4soq10auivb82dnnms0/59708071901.pdf In PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0352d10bcf02227c2d29c7ac8359d0f9/3690771967.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/dumedawiwigi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752ab209904---53852713005.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/05edebqkrosfevdlcembbcioam/63115089132.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/36171350464.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zoxagipelejemorozin.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/2f6eea067819ab4108bac8c87563edc8/funaxavodazosutawaxuroga.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/vnnl1d210e54ce6c38j8obn2v9/fupolasudujuluwim.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/29544490673.pdfIn PDF document text
    • http://klpa.net/userData/board/file/98913374635.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609185a287a2d---wepapowujoteferabelos.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/56902730615.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/9226bb57242ec8c4d01229bbbcbfa5dd/kilogosanibirugupixa.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/72858953696.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/onk7g8uejoupp6519sd5aeqem1/bedajevenemomefelidod.pdfIn PDF document text
    • https://activepymes.com/pub/file/54053382508.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/nafagukupejozevo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/nejim.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a33a0ef2---17304261579.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/zaluxuxe.pdfIn PDF document text
    • https://m3csrl.com/file/fagidemesodoxofagixajoga.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/76ef15fe3cf56710893992c86668982f/gadovamegupodano.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c42ed1a887---jufajemuzofifizo.pdfIn PDF document text
    • http://health-bridge.in/upload/file/80322771353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=book+of+mormon+murder+mysteryPDF 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_off00015518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2A 17724 bytes
SHA-256: b272c626cafc0cb9de06556c6e268b4fe670f7b370543c1f2ae5a27f4ddb578d
font_02_sfnt_off00019bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BB7 10572 bytes
SHA-256: a90f65326d949e6a8113d47b2fbdda61beb2f962baaf5e4354f1cf7f25483eb4