Malicious PDF — malware analysis report

Static analysis result for SHA-256 89be266cb10a26ec…

MALICIOUS

PDF

85.2 KB Created: 2021-07-17 09:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6feb6b45c34cfdc63d721a88dc62710 SHA-1: e82075a400b319bf6e2f9fb2a85cbaee6879582b SHA-256: 89be266cb10a26ec541566491bdd93a35bd479f2ce8bde43c0d08d17a4640073
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings clearly indicate the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ecoretras.com/file/zazozuburifojepuvoxomaw.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4cc6f76fda24e67a05d89555781d9d95/43585557404.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1556a47f0---fuzuroniziratonox.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/jixosawutopemuteketiw.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/zabopotiwexudukuvifasevi.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/wuvogufedex.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/nenogukuzibaviba.pdfIn PDF document text
    • http://sushi-belovo.ru/files/fedij.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/33004764944.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/25249073627.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3oi4spkmt2rq0cnu679t4c500j/13571413431.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6cc7831af28cd9ccd06ac7e878c996eb/gelone.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ef9fdb39f9731c82a80abc9ce0bd0c98/88114247228.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210703_171017.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/2082778298.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/99271155188.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0f211247---75888408524.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f5e5f35c0---vudoliwe.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fbd8adf63---67962538363.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/81748109991.pdfIn PDF document text
    • https://hagepoorter.be/files/files/molojaguxapiwot.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/71898057189.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8a3fe551bfc11bd36fc831c312758334/jakafeva.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/juratigixolifipune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tissues+class+9+worksheet+with+answersPDF 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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 16548 bytes
SHA-256: b5365d6a689a12c05f1b7e598f58890a06213fe9377002220724862bf8a68bf2
font_02_sfnt_off00012d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 10736 bytes
SHA-256: 2ed36d507e3796c600bef756a17397eeb86dd16fae6dba25ed2152ad1a48e808

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