Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d154b2af7fb3437…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 10:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a44e3bf486fc15f8aa4707caa1b912f4 SHA-1: 5edab33f279018cb3eaa4f1bed1da205cd6beadf SHA-256: 7d154b2af7fb34375d328ce5b03eeb1a6833562f6cc2b79b775503a1f541c77d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to other PDF files hosted on compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. The presence of multiple external URIs and link farms points towards a tactic of distributing malicious content through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://smidgel.ru/uplcv?utm_term=mx9+pro+firmware PDF link annotation
    • http://baldonimarcostudio.eu/userfiles/files/67328794725.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a8097898bf7c83d53d368fb48aac67fe/35586459249.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/fuxapexup.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/59024292586.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/jipepamakunijijaxuzifepo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5e1a34f5166e0f46410659448014d65f/wunabiwitojufagapolumaxe.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/jt1o9t2b299f1rqigltqjukg00/27609927605.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/wavolur.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/karudamulinofupisarofe.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeba9cf882---legelegekanapuginipara.pdfIn PDF document text
    • http://videocycling.info/files/file/bugeme.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/mewarorolimakekaw.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/midofamizuluforetagunubi.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/jiwovulitogitoruguju.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/57948659871.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/78459856440.pdfIn PDF document text
    • https://eventaipei.com/upload/files/wumomuli.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/9328204940.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161339781405d3---bikabuwedakabis.pdfIn PDF document text
    • http://exim5.hu/_user/file/belagixej.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/53152015293.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091212513773499.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0f79892a---jadexunukizuwojogo.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/54489139849.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613d07ce8fba1.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/84009588236.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021931352266334.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_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 18760 bytes
SHA-256: bef9a73bc49dbfe7a895dc59e01d3f47468e474fa25319a2701d84711f9c222e
font_01_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 10452 bytes
SHA-256: 38b363d46e05b307aa2e2afda8a11aca673ba1c5b986ea09ce1dbfab96eaf885
font_02_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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