Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a455ff1c637a29…

MALICIOUS

PDF

89.6 KB Created: 2021-08-11 11:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0a88df56714b94ba3364a694fef394f SHA-1: 89117fdbde341a09b96716e29ea7d80d8c0be842 SHA-256: d0a455ff1c637a292cca44f9fdfc86a71f80c950a45a591497d8308de12fecda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution campaign. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pistant.ru/uplcv?utm_term=division+de+decimales+para+sexto+de+primaria PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2hoj5qkpcvv94ib7c5oe9tpekc/sosidalofagokanimatuzera.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ccddd84bbb17bb109c2648ca69168426/xedijofofavabezugusozebe.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-10/20210610115938277818.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a22d47166---bewosividikatofobipiriw.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af4d1d9a7e---weguva.pdfIn PDF document text
    • http://slsnn.ru/content/file/21011008855.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/xineweki.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/85867262728.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/d0j2gag1qi7ha23gvaet1s2l79/14659666964.pdfIn PDF document text
    • http://topas.lt/userfiles/file/gudigexafajulekoxa.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/nakalirezalejebodixemu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/27illn1uahtrnrg0pgqfmsliqj/83613264444.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/47091893924.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040a146431b---17340767123.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/12662649481.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/l2g5p35uas2v81lodqimvl1nj0/35509668856.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9942a5170---49087647430.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6f87aa27---dabipubinuxopomatuwiweteg.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae1814570---92483786757.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e1467a14308cb52e1fe324464ad982c7/muxopegudusavavoj.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/kebirazenisisibijejov.pdfIn PDF document text
    • https://majubesar.org/contents//files/rexel.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/dilirutitewakibefa.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e47a934915ad43ab4253e65f56579b22/73100304716.pdfIn PDF document text
    • https://path.mn/userfiles/files/vibove.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/86512398804.pdfIn PDF document text
    • 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_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 19120 bytes
SHA-256: 96916e4bbcbb8576d95ad43671aa0748d1e15c5b8ef7cceb6048f6ded8ba5a9a
font_02_sfnt_off00013ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED8 10844 bytes
SHA-256: 3d68e01ac066db19c7cf4727b0abd5a74540d8a403c42004940684e0c274bdd2