Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c583f1519eb1ae8…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 02:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8950f36ae49a45cbd5723431c137e62c SHA-1: 331c04f8bcdb39683df6b02671ccddc61134ffc8 SHA-256: 8c583f1519eb1ae847fcb0a620af420a84cf80f8e223f1cbe9cd3310285eed73
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=which+lavazza+is+best+for+espresso PDF link annotation
    • https://muzeumkonstancina.pl/attachments/file/17236858635.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e5fb6962---lajuwumituparu.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/55554294643.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/17872275560.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/getopisixog.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/lomujolazeburoruw.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/2042338209.pdfIn PDF document text
    • http://ezibra.pl/upload//file/87228511544.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/1987595439.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062110453873499.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/24243649499.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/99084781657.pdfIn PDF document text
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/52047868734.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/655e00ab76b81f81c6b4c2691d059718/kidoperovam.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71e8b2d4cc---zumibewirati.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/siduf.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607508d668602---jurutitepawikef.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/edb921b3a5ad4879804810ce563489f7/15722409359.pdfIn PDF document text
    • https://zhansq.cn/upload/file/22533175665.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d886f62efde---26324563658.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/xinorapanopuragilorejo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f6774018---duwijesopone.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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 17532 bytes
SHA-256: 0c7474c092bcc25dd604e1d552cb8a6798f54b2d3d2f16375a696604bb572dec
font_02_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 10732 bytes
SHA-256: 879c94c4e94e240c8d6d612ccb8b158c9279b48a538fde7912b8a4c234af46d9

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