Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12e0c2a72912890…

MALICIOUS

PDF

95.6 KB Created: 2021-07-13 22:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57b12075ccb5456c9af0abecc428c44b SHA-1: 3c7d7817affac9875dadb46b2b49328b48b7007b SHA-256: a12e0c2a72912890e1f0ccee0ce8b57578fa5373ce575bf3c3efce7c146dc557
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • 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 https://coretry.ru/uplcv?utm_term=another+word+for+conceptualize PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/3d76d0c30f453c9ed40f42f29ec1acb6/radotilenisavotedaj.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/gumaviwumezolikugoxi.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/19697318951.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zapivapibuga.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/fojukigurorixovomusi.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/nefitefazofubexez.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc9b3ce972---36783895828.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2413d444e37c118839c9b0ad28dbf665/fonetigilufenararife.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/76627252345.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/57511980264.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/9420775260.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/js7onsp19bkjg2tagc34vejaab/xoturakosefupa.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/bizemeroritizit.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607737ca431d2---voxojomuxogol.pdfIn PDF document text
    • http://snsi.jp/image/news_file/jonuziriseramo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/58167503361.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/xebodewiwoxozabelupivoge.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/19217543316.pdfIn PDF document text
    • https://wrd13.com/force/file/nexomuwugemopekux.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a05a54aefdb4b38e0bb75f1c3e1dc7ed/76736372995.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ed73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED73 18364 bytes
SHA-256: 948bb2cedb274b7dccbdceb4ffd261403e694b61fa430127c10b0782290c0f2b
font_00_sfnt_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off000118b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B0 24748 bytes
SHA-256: d8d7b337098427809b1413f0fb7dd940e73fddfaf8094168bb8b018096e41365
font_04_sfnt_off00015630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15630 10776 bytes
SHA-256: b066d4ad644d5b02ee391d88d87bb142299b5d6624b10bc67c842fbd47b3f6b1

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