Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1084f6657d1b0a…

MALICIOUS

PDF

81.3 KB Created: 2021-08-27 17:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec4ab80a4a67ccaa7a1f19d8020f5c32 SHA-1: 0e9504916882390519d6f174439774ba7dc5b7da SHA-256: dc1084f6657d1b0a872be4d1807d3df44a3f1cb416579f4bf594e925a477da48
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 high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those on disposable hosting, suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://abyway.lv/images/ck_images/files/vibifozuwiliguvegidi.pdf In PDF document text
    • http://ipceurope.eu/assets/file/vosebujudumisimiti.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/t4hobeam744jp2ckpamojg7efq/66797001910.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/votatumadokixijaxupuzu.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/82017056845.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1469920654.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210816140333.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210726004813_n9i0if.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b43da2c93---xapesako.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/s5fvdctj49so910tm6s1tg17t8/28001015757.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/38875671010.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/64116409927.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/regulibevuvubogagorod.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f3fdf4ec9d58c5997778a6c45a201c6/lubudi.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/figekewi.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/pefubipirokuxemuxowiterut.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073aefeb303b---43072812926.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/89347047700.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/bulasitevuluvupa.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/85539446200.pdfIn PDF document text
    • https://longhoang.vn/upload/files/44108674005.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/45462629071.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/71178719369.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/wakizeferisuj.pdfIn PDF document text
    • http://travellerisland.com/files/lazawe.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kopakulajufutizunuzokizud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+very+suitable+boyPDF 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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 18964 bytes
SHA-256: 64f0577211d97daec3603d7724ce73d1b3e593177f632c30b4a89d8f15506c5c
font_02_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 10396 bytes
SHA-256: 5cd5b4622d4a4ab9a2c0aaaccfe550927bf781bdcee9a57b4fb994e6d22a7500