Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0181a49deeea0ce…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 12:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c00e545d3f71eae32abdb12ee2521a29 SHA-1: 6c6c22d0b128ceccd5b9bf85c0b1efc43155685b SHA-256: e0181a49deeea0cef2da20e1cfd07d5e73fe6836de0bb7c3bb237f6022ce71c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chuanghuilaw.com/filespath/files/20210909175657.pdf In PDF document text
    • http://linhkienhunganh.vn/luutru/files/52690938160.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/barewujedafawisup.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210918094606590.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/katadonunilez.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/95129753670.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/68227574350.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/vedotilinibodinez.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/taguxokipotuzenemekade.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/86744828676.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/miwijazofenezipazibiv.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/zivawebojajinulijejobotaw.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad325f6d9---82563267757.pdfIn PDF document text
    • http://lg-palette.com/upload/files/67012193748.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/kuliju.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7daa18bb9---tajunigekakaral.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/39037030301.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/bivebeniriv.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a2d8eea8---miwugutuler.pdfIn PDF document text
    • http://feg.vn/uploads/files/24242711692.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/ruvadunotorozuzenim.pdfIn PDF document text
    • http://congluc.com/upload/files/sazirilorenajigu.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/betowagivimoremovo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/ledemuzib.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/66173719217.pdfIn PDF document text
    • http://dakov.hu/_user/file/zejenowusatamagabosuvuxap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=half+angle+formula+proofPDF 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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 19140 bytes
SHA-256: dc6427932a6387ee9deecf347da39f3f5e2b70aab2569fe7c8a105d2571abe96
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 10436 bytes
SHA-256: 3707954d88d82dcd75f3a5ca9a9d48b7423c67f126cfcf52d2456bf1c09dc632

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