Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25fb322b0d23c0f…

MALICIOUS

PDF

81.1 KB Created: 2021-08-11 08:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2836b87f122c8a140defc0f2bc41df08 SHA-1: d09fba65bf1cbb945487b1a96ecfa6a3f7282856 SHA-256: e25fb322b0d23c0f70a3b465b4db9155e11790fe80f7d8c6c7ad4c643df0d05c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to potentially harmful websites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.srijonihealinghome.com/fckimages/file/noduxiwe.pdf In PDF document text
    • https://waroproject.com/file/lesefo.pdfIn PDF document text
    • https://camelcarpet.org/d/files/4394330244.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/13167588794.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/73830e422f385b31c35845b828cf13c5/zimede.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6c4ae117---wokikoxuturekurotenoko.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8ade151fc056a03e6e8043f74797a7be/mipedejilega.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/98299292340.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ae8a5aef94ef263fc158e7ad26182109/ragita.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/95768087864.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b0e691e0fd6cb20663f28649e0ba5f92/75526625535.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8a7706a9---sexeselowiwukoxomazor.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ab45e02fd4b---20129602000.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/7287115040.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/97331965298.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/03f3786f2e1f19b83673892d4ae6f01e/39984200329.pdfIn PDF document text
    • https://dietacud.eu/upload/file/14012931342.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160801aa41ede4---48774181491.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079b20f30fd7---59933477555.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lug4u86d8ioosv858n1lonhge0/pejefok.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/74918726656.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/pusedaxabifewabaf.pdfIn PDF document text
    • https://wecareprogram.org/images/file/74990652007.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00c5de1f3---vididiwaduzin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=aqa+a+level+computer+science+textbook+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_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 11408 bytes
SHA-256: 670722f7b7ca60d29bb2b549dced2c05382fe54f5667b17397b5ca077c47499d
font_02_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 17412 bytes
SHA-256: 58e88e058bf611b90713edfb2491cc99fc31a9e5c46235be01ba470eb5f5f899

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