Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdd8042a536ad13…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 19:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d998729ac00e799ab40765abe86c6db9 SHA-1: a06ef0b028408a4ec5ddd77a791e4debd7e2d40c SHA-256: 8cdd8042a536ad1354e0a61c82bc4ce92b35ce2ad622caed2be80cae7a40bad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users into phishing scams or malware downloads. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://laborke.ru/uplcv?utm_term=genome+editing+pros+and+cons PDF link annotation
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/idln5v6k9hfhsj9vol8lcurrc7/zasij.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/28363655526.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hj8fe0mags66ubul1nv47i9hm2/mipuvelefamuxopiwofevasal.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d56c88ffc---jamomofo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/92c850928b7fcd2f383de65164c90c42/49528296701.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dd210116a259e9ea8ca7729bc6e694f0/bujakusujegaworasopete.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/203360970860a2b5e9ba83a.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/tulutoti.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/25253753120.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1a91b26a796e00da3256058da2efb018/vukubapevemugik.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/11c9058f67603b41df5f7fde2fadec55/65978971551.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0896cf45---zuselovasibidagakewalur.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf294bcb2---82233909441.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/defobunojunepig.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tf9o7tc9tim5dgre1siccj076c/24612649649.pdfIn PDF document text
    • https://red-adlay.com/upload/files/53622941409.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6033037457---tojitur.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a913bbd4d12---61071028516.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/66327187457.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/divudewulize.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/kujewipibazapolutusijo.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/rijatuli.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867abc27c---79437179494.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/5c76ffc708f652d5d261c056ebe81201/wifij.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2676ca595---lojerinetefanuvimirabivu.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/12389053625.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ce1eb94c---vedefelugopur.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_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 17680 bytes
SHA-256: ba231bd45c9246ad043e9201d808dd935af8283fe4e3cc66f8b3840732c30ac2
font_01_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14231 10852 bytes
SHA-256: 1304943c28884f7e4a9edaea1e4488308b565b40cf04586b5eea3402f48e63d5