Malicious PDF — malware analysis report

Static analysis result for SHA-256 328f8e4503567e70…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 23:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08a3928bf94cf231f4e6c414270faad3 SHA-1: 10c84b83574d47643a2b96a16fd0016ea585f110 SHA-256: 328f8e4503567e7027d2b485ac0de4c3b249349fbf17a26e564cd9807e960a57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The presence of numerous links pointing to compromised WordPress sites and disposable hosting suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attack pattern designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a499ff2dfe---lovifapo.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f67a4448a---36962924340.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdecde20a4---29809813918.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b008f78d---xopokojajojegurudotux.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833a3bb6c48---wekezalazolovitezefuva.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/5332690617.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/39978973028.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a0646b87---bebiwaza.pdfIn PDF document text
    • https://beliangka.com/contents//files/78131438922.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/wisatuxolekovuvizuxav.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jetalojibosekududiv.pdfIn PDF document text
    • https://digireg.com/upload/sovekubafabudaxatapadazi.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/nesalulodos.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210811145800.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/sixotivupuzinapojaj.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/18404981950.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/4564064917.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0dsu0j6ulgmh5f30le268qgn71/biwupu.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/napuxuretali.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/ridawub.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85286e2c5---55566970205.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9b947d59fba740596b0ca8a21158e46e/sufupolanaludulazepadujib.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/aab2ce19fe60b31540f15e66359af7f6/28704802160.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a85ec430c533a7693697b67d4fd5f173/jasopazib.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/madanosabapeput.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/lumuwevugolex.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/sesigimoreferosupixuxaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ayat+ruqyah+syariah+full+pdfPDF 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_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 18968 bytes
SHA-256: bb00206f69cbf1f0c6a5a35f419f1c0f0c2c72c82ca4b967d348fb7b11b00336
font_02_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 10580 bytes
SHA-256: 1339c7a0192717156ecfba8983eb2484e71c6feaf65d69b176684debfe538a06

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