Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc34b9d236047d84…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 22:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8f7c2a4750e5e580dc552c0a67bbdcf SHA-1: 09c3910c273f3713cb2287423262484a8170f2f8 SHA-256: bc34b9d236047d8404b2de89cba561c6f5fd296b5b7fc03836bd4f9f651218cf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=quran+online+english+pdf PDF link annotation
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/237fc78df25a11ab60594c66f9912b1a/rezosipi.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/48qpqn5u4f6rc65h263rsghs0t/82801379465.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/nonotofajobifukalugasexi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eb04525f0---1904710218.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/kumixedevowerita.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210730_035535.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210708114517.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/90a2c5f4abc3cf73a23ecf34953571a0/xugoluzegopezalifizute.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/05582fc21dc77611f09f81740ec2d77b/56567691712.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/plk1pnec9ug4d73mnhjifrktua/vamexo.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce986f3645---56871751860.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3de2d06390---43498127138.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bb71d814a20d72c1ef4c21ab4cca436c/4793389713.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/jofixenoxisadofupino.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b9125185---41002778792.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/378adadd53abd61c635bc79e8d0c8c0e/77835295485.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/riwuloxedovizonigegi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702eb353f26---wopogafe.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/mujimer.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/53409917128.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/87478169292.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a50f0cace0a---94820319137.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f6b61cc552c2a07fc37f3ece0fbbcbaf/kofureju.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_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 17740 bytes
SHA-256: 19ff6de1f1a628a6bc9371d669f7ce73f2564c6312141d6f383e92820915318d
font_01_sfnt_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 10836 bytes
SHA-256: ee25c21c8fb030f443f47fcb9eeadd6623bf8f9bc29a23bc773601e6c878d4a2
font_02_sfnt_off0001420e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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