Malicious PDF — malware analysis report

Static analysis result for SHA-256 f373a6c12fc5a61e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 18:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e9a9ed67911c0e0e8b14aa8a19edefd SHA-1: 0a3c6be3cedeba49ff0828513d83a80d963a5606 SHA-256: f373a6c12fc5a61e04eb4e9dcfb9c5b5d064ffeab1706933b34ecfc043ae0714
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or scam attempt. The heuristic 'SE_CALLBACK_LURE' specifically identifies the document's intent to trick users into calling a phone number under the guise of a support or billing issue. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://visit-pune.com/userfiles/file/85071762654.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070735cde8e0---dulum.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/zokudujif.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d52dc6bb4---fasameni.pdfIn PDF document text
    • http://dr-temt.ru/images/file/gajenore.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/36798880321.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/taviv.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/sotapapibixogajatubifu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbf11b8d5---mogapupamubidojejuzog.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/57857710177.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/lajulagovikixidukovax.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ae12e06b---nibizazonelaxazub.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/suxubimibesezez.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/94734118608.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/rerarixife.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/55182372426.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6925d4e53b---zifigopowo.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/53923484937.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/75767055019.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/dumejubidipuvemikovosopu.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/54864832511.pdfIn PDF document text
    • https://tekartltd.com/upload/files/zereloxe.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/lrg8lug4bc1i1rkvj5qos5j5n1/selewusabuleravup.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/wusozigokitejafazavuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=famille+de+mots+cm1+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_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 20080 bytes
SHA-256: da1c137df1b432ed746d333edcd0e66ab18f7cc1930d45013511e077499f9385
font_02_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 10608 bytes
SHA-256: 71220baa4c7923530c5ed1b83b6e6407b094c2dfcae7dcbbede2d7c7ab2834f1

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