Malicious PDF — malware analysis report

Static analysis result for SHA-256 2752b8adacb1b66f…

MALICIOUS

PDF

109.2 KB Created: 2021-06-27 18:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 66036a5875b1f56df7b947f9dfe9e9e2 SHA-1: aa0170c3adf9bd2c5eaa22a9a1c27d64675ea4b0 SHA-256: 2752b8adacb1b66f63daabc32466e8bb378ecd4d3876a9fb4a98cc95f93d1a30
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination and evade detection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/fd86062328a463d62cd7441759236309/64474165891.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63fa57d9ed---lakigomidenu.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/6637438288.pdfIn PDF document text
    • http://capital96.com/userfiles/file/45361812274.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/91000c996070be02deb7fb640ba6e7bb/51263847965.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zepisotibuj.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf01653b3f---niberorikuxal.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/c1a81ftd6hkb7m5ftp5nco3ldl/42781271133.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf06f9cfcd---tidezivo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/67l62c5blcjg1if2n9m39ju522/91341872997.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/jikejedorelowenemilomale.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb88456812f---50961452981.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9af5a9a0---79721601600.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6b0e8dd37---74931760396.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b4ef1b403fd16a498a9727b863b1044/zimezigasurij.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///73837831735.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/954c61f4967c09637e9e0f32fe300a9a/53059252526.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/58bgd08f3arstinfpd3palaa60/29692554120.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/kewolagugiririxapop.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cb3a4bff99fc94e5a0d433dceed70abe/tuzetaxexowakivosogiliwo.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/jovisowoparezetalekuva.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/toxaxafizejomexage.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0dc2c63fce4d2d5b6b22ff8725f299a5/nuritowefuleg.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/novafepabarakegajagiva.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fq8dijlntb6ko5f36gsdrqmdc3/35557515010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=reform+and+revolution+in+the+philippine+historyPDF 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_off000146bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BD 17040 bytes
SHA-256: 51b795940096d9680adea6f6ed62fa6d6a2967047fe1e68d7a11662974fe9d0f
font_01_sfnt_off00017372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17372 11088 bytes
SHA-256: 34e11ecb05780badd4596dd38d1b45bab1ed8ad17e1ee69c10b9447d549556a9
font_02_sfnt_off00018d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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