Malicious PDF — malware analysis report

Static analysis result for SHA-256 583ac643498147a7…

MALICIOUS

PDF

97.7 KB Created: 2021-06-28 01:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 751712a45c1442f0bf349b347685157f SHA-1: aab35786f6585676142efa83633d55a7a4fe2085 SHA-256: 583ac643498147a7e5f5c4cab289c67986a5a87f4eac158f4b9160f51e9519fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. While no executable scripts were directly extracted, the nature of the link farm suggests it is designed to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://brukbet.com/user_images/file/53388457675.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a5e8915b---vadixonokajegiwagawewode.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/udqh1v4ol6v6lib6l0vh5k1opd/wudejab.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/26320815698.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/99867612252.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/sitibez.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/cc2a3c45719c72c239cd6112943e049a/wumufu.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/dadukaposejomuzutikumive.pdfIn PDF document text
    • http://usagimatur.com/files/others/49715284793.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ece6c1a3a---nexosovulubemoja.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7aaec040---79133721649.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/sijugaj.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/8381cecf1f83e4640540744507108c5d/14712231774.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/73557551092.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8643e792---nuwikumobawosidokix.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o5aq4f75qp3keu78iaja1blg52/61814291342.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/66056883916.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4cf02c7a2543b61ccc95482ca6bf1c86/gisasenabibevobaviboxi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e78044eb6---66738089419.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/nijex.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/76858b3ac178ac164924771adf9a8fb8/53617468537.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/wosevurijilidajupoz.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cd5b7cb3---74377782548.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9c3dc10d27bddf1c459bc62328098e6e/talesadexozawijotur.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5209ff0449cd1f520fc72534a82620bc/wopalapefo.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/nujovas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+some+ethical+issues+in+researchPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/11385161348.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 17232 bytes
SHA-256: 4bc744635b3959edd633b71c9e4b04e9d297db2fae2d383c10d9d855804cf7c2
font_02_sfnt_off00014560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14560 10588 bytes
SHA-256: 951211a9b2b285295f34716bedae753b9eb0dd0d8877ca1029375cf7f2828830
font_03_sfnt_off00015d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6A 17756 bytes
SHA-256: 40d46f226d56b18bcfedd7de0cc6bfec50ab2fd9e1390cb481f7e277260dcb52

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