Malicious PDF — malware analysis report

Static analysis result for SHA-256 283d01d26f4adcd1…

MALICIOUS

PDF

87.8 KB Created: 2021-08-01 04:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7d41537f750c1f65b7a9e988a9ca8a30 SHA-1: db2abd582112ccfd2d454ffe7d117730bd6b0b57 SHA-256: 283d01d26f4adcd1721bb4467c368f669bbf772e1b17920e2e6c36225528eced
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The file's structure and the nature of the URLs suggest it is used to distribute further malware or conduct phishing attacks.

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 http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/vobusunedozinudajem.pdf In PDF document text
    • http://taiwan-tsai.com/upload/files/gixotovemami.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6a134d48---48508798353.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/78871798890.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/2224009453.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/mazir.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/30085414dbf3c8c5ae1ceff4ef50bedb/155785346.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070020baa3a3---fikegud.pdfIn PDF document text
    • https://industriameccanica.it/file/wukajemexiratufonawavuj.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/73732245504.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lupufebuxogif.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/rigeni.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd751f698c3---vuwaxemozinokirubop.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607531bf35a4e---zubipewajuzodeb.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/86261193116.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7cabd969---61621325399.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/95922253290.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/41679983537.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/gidepotiku.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e6ed9965---51153035215.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/2243418605.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/73015319450.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/zinikave.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/33734915096.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc640f31640---36659545028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=permutation+and+combination+practice+problems+with+answers+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_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 18184 bytes
SHA-256: f7dad0cd4bb60095c2686178db439052eda2b99bf04be0eee989eedaefb0c3aa
font_01_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 11212 bytes
SHA-256: f524992713909b1c0c2d2e1dcb18e36615dc2004ee2656905827059b7f5c9358
font_02_sfnt_off000138a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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