Malicious PDF — malware analysis report

Static analysis result for SHA-256 031234e6dad44b04…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 08:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbeaa1a7d87826b0fa7cb9552fa5bd2b SHA-1: ec6e1bd004d44a23dea2e380b8089cfb071e3da6 SHA-256: 031234e6dad44b049ee1578d4915f5bb56bea3a994adbde8352295cf2193343f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiodugnani.it/userfiles/files/tixoguxasenakilog.pdf In PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/12462654865.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/27576065755.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/kojasizuseludorijaru.pdfIn PDF document text
    • http://knipia.com/userfiles/file/24493276036.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/33947824982.pdfIn PDF document text
    • http://splogservice.ru/content/files/51657672964.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/fomabez.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e41ecb9240cb3b12b15e8aa8e79bfe2a/66318740590.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/19196810638.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/tevutinaxos.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/womaputozawazavogirufe.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161407a14026c6---sobewejigagij.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c03a20a76---68861500656.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nolivu.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/62137936180.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/1479448124.pdfIn PDF document text
    • https://sopkambing.com/contents/files/xufawovovorevifazop.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/23877025274.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d03e5ca98777b12b1e3de31fdfb38b99/12229739380.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sivamodizosovapikapemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=past+perfect+and+past+perfect+continuous+exercises+pdfPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/8662660243.pdfIn PDF document text
    • 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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 10768 bytes
SHA-256: d364cca217d82ce1b22d1c837e89197b12ec7884cd5bd7366942d4d26cc802dd
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 19204 bytes
SHA-256: 3dca3ebb3ec4a956239b1f87653b9203369065e798dfd5697262f95b941cfd42