Malicious PDF — malware analysis report

Static analysis result for SHA-256 67706f71677df18c…

MALICIOUS

PDF

76.5 KB Created: 2021-07-30 07:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a46ba4d8ed509f82a07c5ededa20c15b SHA-1: f8b7f399a8c72ee0ee716d4efb81c0bdacc3b473 SHA-256: 67706f71677df18cc421209033aeb1f4f7dd29a8a4492bf37315e2e383224fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=ejercicios+transformar+de+decimal+a+fraccion PDF link annotation
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18699717a---xowajemutad.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/94585099538.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/cfbd649bb42a5fba29fb244ae5c34abb/72259749114.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/wefipogiwegugita.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/wedoluduwalu.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/maxirukut.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607495614519c---54290883652.pdfIn PDF document text
    • https://mfdesign.hu/files/file/96069082227.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b410e8dbb7e2c1db7cfef159d7126efd/98304758633.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d633ae60140f53018bb2ea44c5794343/bawexupenupugel.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/35648173530e0033d78d071516aa9413/71789194193.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/12392284087.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b8fbc8aebf0234a7d1284a0e96375f43/23872758597.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da71dbe55d---romamusomu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vm3cqb33rgdgrq8ua8dmjo3k80/70240757710.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/xonisixowetoduxez.pdfIn PDF document text
    • http://beateromer.com/bilder/file/fiwiteginatuzevexodiw.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c313af2396d---63079682781.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/gevinisatexedazanivu.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kimonejujeg.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e75d36f5acdeac15374fa98e9fb5bd18/vazetokeda.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a3ab4a735cd044410bad06b1eaed8cc/gifaleso.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e35e41f2d---63003097654.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_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 10748 bytes
SHA-256: 3356ae16b80d419be8fc7b6abd14ca0161f5f8f75f4f81709176df10f4175228
font_01_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 17060 bytes
SHA-256: 90f74633e5c1b07c82a6e399aaa1fb9fc344754029e7fa8b3d9fcf74fd1f8814
font_02_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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