Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b029f44508579b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 23:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64ea659f9c65f010d0749b833bb14389 SHA-1: 370326d969ba74039610241f7732c57b549587f2 SHA-256: b4b029f44508579bde5c3634b807a95f14deacdcb6127eeaf06919ccf94e5b22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=how+to+clean+my+internal+storage+android PDF link annotation
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/3219850141.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3f6a70be---setuzaderarezi.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/28463193638.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/74469450247.pdfIn PDF document text
    • https://ahha.az/userfiles/file/11864608848.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/kidifot.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/53011323889.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/86770252141.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zifowelopexagoxusoz.pdfIn PDF document text
    • https://invest.pl/userfiles/file/69876097786.pdfIn PDF document text
    • http://bubb.cn/up_file/file/21688980186.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/70533566072.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/60865672350.pdfIn PDF document text
    • http://lovesenergy.com/file/xoxebulep.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/80210398215.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/99411680549.pdfIn PDF document text
    • http://tyextractor.com/d/files/60963966762.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/weliserura.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/wusidokaxoto.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/39735742874.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/24481626199.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/bunipewuxovimevufanuzi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614038e1d1100---bidodakar.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/44161356855.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1714dc55---sivujemomusezunewe.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_off0000b407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB407 10904 bytes
SHA-256: c79271e34b6d5bfe015cf637ccbdfd7f8c3b3a1f767adc42e3f4dd24194c0be2
font_01_sfnt_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 15392 bytes
SHA-256: 03a97061683303f924e705a2a6778e685a6b2ec41d895b67467ce827d7da38dd
font_02_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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