Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c4926ef676b709…

MALICIOUS

PDF

105.2 KB Created: 2021-08-26 10:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 383467028c987f2f20b0bf32d8993995 SHA-1: 3383b980dbda8f10bdae7b6f79fbed4ccf1b6bf6 SHA-256: a4c4926ef676b709f8d560b2c18f537fe97554dd9bb0c492f17f0106045b0716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to exploit user trust for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/22b365a6835a0747cce40f0f41992b16/kajuketuwuni.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f987c47771bf17c857578112ef46f6d3/91988783095.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/9b39c45b9428268174fd34d810284ff4/50800902487.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c000b3da4d5---mitemosemixibajotowusini.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lu8sui44bumgq0o7f6h7l8r8a5/gelikano.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607360476fe3d---45332353751.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c51533d62ab---50927976569.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pupafugizixaxetakamun.pdfIn PDF document text
    • https://bataretak.com/img/files/file/lojelavunosezibuzod.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/vujemalokudobexifemufo.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/51649552458.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/nk581206uvg2n46efti1ah6fcj/gakotupulewamoti.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/duwazonitovafowa.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/52621655568.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/remikomajajilizepezo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bb3580bd---natajepojusoxelisimejamar.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/43015069298.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fff2d6fea2079b40b3728d37dce7dcd6/88724438139.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/52d69b540fe72da7e4303b9b96e569eb/wupefutupejodalofigenudu.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/difazijeza.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4d5ee5f9---jepetabakefukijim.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947af561496---wikarikuvaxuberidor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=square+meter+to+square+millimeterPDF 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_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 18268 bytes
SHA-256: e29d99bec94db1640c53d59daeb8121528112228a565c8acdaa8afca242f6080
font_01_sfnt_off0001668f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1668F 10488 bytes
SHA-256: 79c49b7752f163739ea3fc622d24e23e1c3b177f16946277c42a6799bfdf0241
font_02_sfnt_off00017e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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