Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ac39278a722d65…

MALICIOUS

PDF

121.1 KB Created: 2021-07-22 04:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cac5e4a420682a3b8b885702caf4a612 SHA-1: 7f6ab9ab83d311be95830ad255e583b451cb2391 SHA-256: d4ac39278a722d65907f8f4672f72e2f501c741b703f04288b106da79b36f3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. The PDF structure itself appears to be a collection of links, likely designed to redirect users to external, potentially harmful, destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4c863544---95255252991.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d598487ce---75242689552.pdfIn PDF document text
    • http://capri.lt/userfiles/files/49084746050.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/5122853657.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/rarinix.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/021ddb30c2f48f7a632a0e84df5c1963/gewagodixowidaberinikusok.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5330cd2361---gorikafalunobavet.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/36ffe616356144baa6b563f484bf6687/4555771858.pdfIn PDF document text
    • http://goldmustang.com/files/files/87043113087.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/komezezozezoduka.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/27ea1d561944d62fbbae69841d14f837/kinonaxunemujowuk.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/27087671337.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/57563723971.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/nolonajijadofuvog.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80604413351.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/3083416821.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/koxotutijavumodomawo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/sazuzumolasifiter.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/634f472fd28a14df853712d4ae37ab8e/56951719240.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a8d944d3877f03ce9e046c2aee5a13a2/katererabizumetosimot.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083722999c82---zerusupekagiwumuwenabez.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/jinezizijurox.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5ad22ad407c55d8e34569df9bbf97fe6/kinagarazozejefininefu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/94578461014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=autumn+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001a294.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A294 25548 bytes
SHA-256: 10a8202a7cfc8abc852333455e83294cae35ab0c3708ea7641d31241bceb6e0e
font_00_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 10416 bytes
SHA-256: 89a77b62efebcd332b128562b4ffb760101cb2b36cfef857983138927ce156e5
font_01_sfnt_off00012794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 34516 bytes
SHA-256: 6563d3fcf4f770e1687e476662b455aaffdafb97cb42eca0bdfe95294fe85c6d
font_02_sfnt_off00017931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17931 4676 bytes
SHA-256: 064c2f0cec7ee00c76adab68640ddfd46c8f5cc83e3e6839550229d157b83cb4
font_03_sfnt_off00018a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.