Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd705c46f57c48e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 17:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5022f0e6f53f44aecc1b88cc73b41d7 SHA-1: 5219912c158a2cbb88cb304fffd9f79b0e9f446a SHA-256: 0bd705c46f57c48ee8a428024d079d88fd32d224a7ca5bb050a3f94e6adb0655
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm designed to redirect users. The presence of a QR code lure further suggests an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://clear-es.net/yamituki-n/uploads/files/lefiviwizewukejuzasut.pdf In PDF document text
    • http://serting.eu/userfiles/files/lexikavaramagijubo.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/pomirogojexuseji.pdfIn PDF document text
    • http://chipgene.com/image/files/20210906_064829.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/96154546988.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16314763511441.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/36781847260.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/lagodiwuxowawipurebifuli.pdfIn PDF document text
    • http://puisan.ru/uploads/file/mozebenuluk.pdfIn PDF document text
    • http://wohntraumgmbh.at/sebutewekijuzip.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5db51f99c9f0289d80740425869d8c5e/patovibisobodibemug.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba5fc9151---46978538668.pdfIn PDF document text
    • http://saaretravel.ee/images/file/fiwej.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ec5aa2ecb8d87b46d159f2de6f04a9b0/neragane.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/silevevanejirewijodapusi.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/75073327311.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/jemuxowemoj.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613907e4ecc44---42528327138.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400dfb96058---jizilofagoxiwi.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/jivudolilasa.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/tilamifuxiwudomakiral.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/memudofosegidovuvikofivej.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/5459722501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apk+shareit+appsPDF 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_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 18428 bytes
SHA-256: fdf19ced915725017e3e42e450b056da8e3bd2f5d5dccae74f07ab58f0361cc2
font_01_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 10152 bytes
SHA-256: ec5e87a67c687f85c4c14c8819a6c7933cce00748da2f67712f53783bc37f49a
font_02_sfnt_off00012b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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