Malicious PDF — malware analysis report

Static analysis result for SHA-256 145e7742578cd3bc…

MALICIOUS

PDF

70.2 KB Created: 2021-09-06 17:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1c0f0854be20faf6646f62473075cf1 SHA-1: 365a4582206ed18baaaabce2645db093e7f1873e SHA-256: 145e7742578cd3bcd7f0674a03378aec944d419bc6ba5b5dd9843f2d6c8baacf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://eurogeographyjournal.eu/admin/fckfiles/file/kugifidupox.pdf In PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/xiruwezop.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/pigogevibidexetafu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d0bbe9c9aebb6e777a804d6720be96cf/vunaz.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/kuzawudekiterabuzap.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/72504319459.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608263727c4c0---96689311574.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a889be02fa5---xupisesa.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/55890479664.pdfIn PDF document text
    • http://polkovnik.su/upload/file/dijawavuk.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869bfeb7a1d---25208510396.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/82753989326.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/7532898731.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b91642a42---9262410590.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/75f5aca9097d7693928b336846e16f87/xazilarimiwizesavine.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/65559228225.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e2fa41c2642be5a367162f4112831874/xuzulajuwagatomiwa.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132a2ffd2325---wusawivus.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/baboxexowaxogolawel.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lorosunum.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee6c4e036---gufekutoboniwiles.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/lolinirovexokekuxovidemew.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/65e8ad978bf1ad2d0ba0e88ad1e0dfcd/78253892487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=expresor+cafea+delonghi+manualPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/38027153483.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_off0000b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 15032 bytes
SHA-256: 15b893647efcabc7b5dbedca2e9b4eb2fda7e184a6f8765bdc3db811385064cc
font_01_sfnt_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 11156 bytes
SHA-256: c0237eb57e1e3b371a5225940eda07ee7a7ccd4cd8492f50733cfe6050c41ec0

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