Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6795afd147e3848…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 16:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc229a5ee612d78c676c1b2bd38a05c2 SHA-1: 9e4fe6ad521a1b70167086c62bd99b12686dd956 SHA-256: f6795afd147e3848a223dd878399ecfae2a8e47f88b6ff414c5be81db53fbdf3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves luring users to these external links, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607692c2a4e8c---96176120802.pdf In PDF document text
    • http://casier-a-bouteilles.fr/file/zolorogu.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/givizixifijudofutumog.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/bagoxiximorawisodez.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608373fa411dd---dujobepuxulo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb191d5ed---67205532119.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2e729eba---12850794597.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c8308244dacbcc6f2100534d325d250c/vudenufilamejimoxovakij.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ef995807---21239238759.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/vumadoveduno.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/52a3df4e1cfff0325becaeb431292ece/67256144826.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610920df2b6f5---sivufejevelujovumufaju.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/neranusabidoga.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/makipivagoxixotam.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/wutixukefexoxowebamorake.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/5395360868.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae474a8707f---xifurax.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121c1be81ed1.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1ae8fae706fbfb5c777b32d9fc3749e1/79262358266.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/84581420292.pdfIn PDF document text
    • https://digireg.dk/upload/zusobofimowotofenoveragi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=operating+profit+margin+definition+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_off0000bfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC8 17208 bytes
SHA-256: 80828d952f1355e5709a33c65fea215816c375a385355e2151a387194f8a441d
font_01_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 10652 bytes
SHA-256: 96cef14bfa8e3b6fffbcc0e8f2da56af7c65a5da6c5cf9ae86a2b9c4a36669fc

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