Malicious PDF — malware analysis report

Static analysis result for SHA-256 f801ef20df005bb9…

MALICIOUS

PDF

74.5 KB Created: 2021-10-13 02:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d6beb0760e7ba980c47c4f98a880f9c SHA-1: 068aa48a0513b8efdde00bf69243f5a1489b5bde SHA-256: f801ef20df005bb9d3140a39035c9e73eb03dce1a4ebaeab03397249358983fc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://paykaaluminiya.ru/ckfinder/userfiles/files/nukerejawekisulixifim.pdf In PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/62719885275.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/jawanokufukuxikum.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/nulowudegivurifefo.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/folizolomivi.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/fujimedurida.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/17120449083.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9e1b4fe48a326f6fb6c681115c759386/44577387848.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/wolibirabopilusadiwepejaf.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/bamabalaro.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/fewaka.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/wovigezazasima.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/vimukomumatizow.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/xoseromamubufogulanu.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210921043508.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/vusapemusagutagekarapuweb.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/vakidilukawagutudesun.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/12853339025.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/50472601266.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/40321622044.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2qi6n2mqljovd889ddnange836/pigise.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3ad0cdee0c3396867f9ada9662a14e6d/98049310801.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/95027254705.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/nikawedetosonem.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/tuvibe.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/64840243827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/cmwvf4RlXg4/uplcv?utm_term=100+m+to+kmPDF 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_off0000bff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 18524 bytes
SHA-256: c01e7ff1b8781d37920629cd5494c377cac1173b4b4aa54856eafd5b67a3e447
font_02_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 9636 bytes
SHA-256: 8f4222450c130023c3d7f28cddbaf1efadd44ab61cf2bc246554db162d7042a6