Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a819a16e4c128c…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 20:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cd2c19a2d519b36394569114a152832 SHA-1: 8062fb3d6b995b6c4ac31d39c1937b67f781a90f SHA-256: 16a819a16e4c128ceab608e7176a3fd818983b18c7595a9cb1e6b9829ef98825
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment used to redirect victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=studio+music+apk PDF link annotation
    • https://golf-tout-terrain.com/publish/page/file/78380217655.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/40031358653.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d38879ea393d3cef8b2c9e05d5d857dc/936796488.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/ruwapemenasimo.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/figiz.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/49349158665.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zamuzatolet.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/korarasufufab.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/luvipumabute.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/12823025635.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/74e6ff18862ba205bf956f45a53005d9/xoliwasikofulovozet.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109080948041243.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/jeritot.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/46032112286.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/87600692064.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dajazutesisedokanera.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/62602999513.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210912185850.pdfIn PDF document text
    • http://citra.cl/userfiles/file/didab.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7ebaacd80d8585e1365893b221f4dff5/rovaxojivi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/77072453036.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/61002049044.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/xuwojafimudomudajigebas.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/78124858351.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/38304502263.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_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 19340 bytes
SHA-256: b026dcf6dd4f0cb3e2fe09115b34d7ccd87e8b1ce076e299bc77cbe9d5a13f9d
font_01_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 10560 bytes
SHA-256: e3f1e654592d7b2e0654cd17381d54abbd4801067db6fe57f1e09b77e33f9605
font_02_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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