Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78d53c3ba991267…

MALICIOUS

PDF

85.8 KB Created: 2021-08-16 06:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a54bef8b7f3ccfdcd3842192303ec482 SHA-1: 614222b698daefbd49a22dff968e9cd7a7dae297 SHA-256: c78d53c3ba991267941e707e17d89ff98ce636447a73433f4fe5cfa55dba56d7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a callback phishing lure, prompting the user to call a phone number under the guise of a billing or security issue. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggests a phishing infrastructure designed to host malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fonixkoncert.hu/upload/file/53317074324.pdf In PDF document text
    • https://network-italia.it/file/49399850734.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/98de9c1cccf0ad83a46b3c14eac8fc1b/mikokawabovinulanoboba.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a6339c3ce0ba39076500777080a883bd/gizuz.pdfIn PDF document text
    • http://charontrade.hu/data/file/97424007470.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/55299990733.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/3512160333.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9936b8b64---66427949534.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c1cb631d09c44e9cfef986d85a3c8ef2/9879364907.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/genoliwa.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/rarimotejufodisijojasijap.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/josafo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e827254ff12b1685b018d49d7cf21f35/dovesupepifa.pdfIn PDF document text
    • https://eternalbliss.net/file/88907206183.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/jixod.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/ruruwusorirabatirediw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47381c571---mobobebaxodabazopato.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/rosuje.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/23285430275.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/38140694171.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/77373342810.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/59104268966.pdfIn PDF document text
    • http://crm333.com/documentos/file/89422848182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+withdraw+amount+from+atmPDF 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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 10448 bytes
SHA-256: 01444e5c7697d4f49d33104b48b331e825a8c5e46db80475a6c4d86e4b4246bb
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 17124 bytes
SHA-256: cb74682e8acd025708cec7f034e8f43e938b3322d3f455c6ff5f8f70cfc89b96
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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