Malicious PDF — malware analysis report

Static analysis result for SHA-256 8483a81cb0dfd89a…

MALICIOUS

PDF

86.3 KB Created: 2021-08-12 00:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5c1b4f52fb1583df16b4382e11058f4 SHA-1: 445304def4477cda7c97c5b40d967ec915a09003 SHA-256: 8483a81cb0dfd89ae046f7008d23f06f8e5c46bd47ed34bb38c23fb5bf2f603f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or SEO poisoning campaign. The presence of external URI links and link farm characteristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cuacuonanbinh.com/userfiles/file/dijoxefepadudi.pdf In PDF document text
    • https://promise-land.com/upload/file/zapes.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fn8g3ljrbit5550jmr1ju6e8cn/26874814026.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/rabinaduvesalupoj.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/satalagejil.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/8d0247895a47494300f5bdf45f2598e8/guvodikozukaborapowekegu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/31696128819.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/mekesisumugexadijubiwusov.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/kodujeburi.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210601_1D6C73EF78E2F64C.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/jusozusowodonibevuwilumag.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/kusazogemokixibadajemer.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160efd65fb820c---xotulutijeg.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e84076d62dd8d82cda14bcd379a0a4d2/sidigasulapo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e30b589da6aa8e1f2a7c22d199b80d0/wugemapuk.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fd4f85998---ponowiresilumowagaxopise.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/80091090912.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/3iepvntdhfapl0pseshfvalspg/26260141995.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ikqv2vrhf4124dmpedmdthld4f/19949009624.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/72121892517.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/19274371372.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/44248695622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=simplifying+trigonometric+expressions+worksheet+with+answersPDF 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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 17356 bytes
SHA-256: d59e04d4d2c2ad907478399362b6aee5d41b57ab1477e43be238c3c7e49629fd
font_01_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 11396 bytes
SHA-256: e900c8316973d34803bbadf83ba6c7bf22523e555c1ec3f16c1177eafbd0c9f4

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