Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc4229522606306…

MALICIOUS

PDF

86.6 KB Created: 2021-08-01 09:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67def739943b68adc66993781db74308 SHA-1: e1389eef414acb23fdb0f05c564cb18b7bd5d6a0 SHA-256: edc42295226063063e243e19b7e8a151966780ff6585a78078dabc87ec60807e
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a raw IP address in one of the URIs further indicates a potentially malicious infrastructure. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://soudurelausiere.ca/upload/editor/file/sejaga.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160797b602bc32---koxazuvowexuruwirorom.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160efef2f3e862---69220953244.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/wubapokukebetawasu.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210719073802.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/83221c50dbe7cced9947851de4b58088/95816430389.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/zetigabumozodaruroj.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/32963902053.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/pozokosubomiteko.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609631799ca2b---32816078985.pdfPDF link annotation
    • https://perfecthospitals.org/FCKeditor/file/54595075262.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c8ac339ab7da113ae5e894e360e38a8e/gupuri.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3edcc79d7ef61b82d9de194e50987612/79212129961.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c33a8b0231720913dd4ddc6d049e795d/93159529801.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/94594124797.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/88333543229.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/afb4134862e8a127711715989698d3cc/zuguwuzesobolezapevav.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/41317487116.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/72139482357.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210725024449.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/82458937542.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af01d9e6b17---poralix.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/dejupolum.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba344c2db89---wolopome.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/45a7b8e31cfc6dba2e87d7cb8da2736c/15184632196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=griffith+introduction+to+quantum+mechanics+3rd+solutionPDF 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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 20448 bytes
SHA-256: fdeec9181ba5dd24f84b57a75d08de76dc75fe44b8c24903ecdadd37dc4e9ba4
font_01_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 11200 bytes
SHA-256: a0a7cd2841aa19eaf343702b69319f25e336dbf1bc77124a680896d431b37500
font_02_sfnt_off00013326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1