Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa3dcaeefa7e3bd…

MALICIOUS

PDF

85.6 KB Created: 2021-07-10 01:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dfae0f35a0766e91419dee5eb39b0ec SHA-1: d2f21d39210f5cc6c57c6e895d2915b92cc54d22 SHA-256: 3aa3dcaeefa7e3bdf985964f03649d1f8a637f8e72b50576573611ff07eab038
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

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://synerhu.ru/uplcv?utm_term=structure+of+reflective+journal
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/poluvibitowa.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e7187f95---jojipasa.pdf
    • https://eyetracking.pl/userfiles/file/67232485871.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d3024655e15---95752201159.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/dopuzezonifug.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a4c760b16b29c861d42a73743aab4553/waban.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/bat2ul15a3uvao3jsg6ajjk5k4/jodopekunulogugobutipibi.pdf
    • http://ilkyoukais.com/Images/Media/files/nosiluvenunoxoda.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d8eb8a0a---94121562092.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e131765---83032289048.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/2f261070cb85b837a6feb541810b5b43/vakafafigiruteje.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ac96d9903---daduzopuvexegeputiralefov.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94d7c39b0a---fazivobo.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e9a3fcfb---mitinuru.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af64cc3fe4---38456087698.pdf
    • http://huile-de-nigelle.info/userfiles/file/ligibawezidarigurijad.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe72be9e62---xosujolupup.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f055b80e02---9328374015.pdf
    • http://change4best.ru/upload/file/fasetimamezesopazi.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160799c3c92538---86908250162.pdf
    • https://careeraccelerators.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076115fafb39---deguxiz.pdf
    • http://ecandrychow.pl/Image/files/donuj.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/i56s05v9n527du6nqvgcltiiuh/didum.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4a878efd81ff3734bed0ca6c700c2709/dutoxejetopenif.pdf
    • https://cailux.lu/userfiles/files/7695568737.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc5.bin
7872259a18c0c49e04ff8b0562fb2dceb7254a8f4db2d4a7a321feb0e881234b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 16972 bytes
font_01_sfnt_off0001189b.bin
196e40b7cc6d8a4257c68067777b5c8d6e8ef796495c2c9604f4d54292ad41ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 10532 bytes
font_02_sfnt_off000130b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 16792 bytes

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