Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bda693263c9e25…

MALICIOUS

PDF

101.4 KB Created: 2021-07-16 06:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1e536f42374eb5b1d3cb34f06133ea2e SHA-1: 627946fd138398b8cfbb8664100475016bef370e SHA-256: 01bda693263c9e251d251feb6bded0050bbb1cf9ff4c6d6aa5df02361f129868
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://assushop.com/userfiles/assushop.com/file/35811768180.pdf In PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/boviwutuz.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073e23a43903---kupejatod.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/7044809102.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/k6045kvnjgnklhjisa54e5j5gv/komativeromo.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/wozupute.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/70680484460.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sukimobigukedamuto.pdfIn PDF document text
    • http://canadanur.com/resimler/files/vejonopajudirupudad.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/mopufowipanefotul.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/95655965926.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/251fee6c0124163620bb75bf11c743e7/97073252163.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2e8c80059fcc1513d3b86c9aadcd039a/94347780904.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/13313547296.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b819e5198ce---kekorediji.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a615b831---70593299118.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/50598202294.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/30046292658.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/90735745916.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160715c0542396---14146354397.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f544dcc6a09bd77e0ff38f434b6aaa31/38756315516.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9921188826a93360e4f9ea3b75d0e394/62819197718.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/67019065309.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070c755b8aed---24466041896.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/nidana.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/adaa41b673e01e26b3f4d861a8572071/vizuramejanopufare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=referee+with+yellow+cardPDF 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_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 10548 bytes
SHA-256: 425f2ade3bb10ad2f224553d762fbe991bb5f975a92016415b915bc0533fe52e
font_01_sfnt_off000143e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E3 17120 bytes
SHA-256: 87478bc4083cb814e2fd1be0d6a1b838a1d51ff9427c7f3a23fba3f66babbac0
font_02_sfnt_off00017021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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