Malicious PDF — malware analysis report

Static analysis result for SHA-256 1606ede0c64b53b9…

MALICIOUS

PDF

96.8 KB Created: 2021-08-12 02:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2f41c8431055ae556a42016258e63181 SHA-1: f0f23676f9e9f1597f83c1885de347140c7a0ce9 SHA-256: 1606ede0c64b53b94ebf660e3a280dd257482c3ce44bff170a5a7cef2ebff98e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a UTM term in one URL further indicates a phishing or traffic-driving campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=es+file+explorer+apk+free+download+apkpure PDF link annotation
    • http://rialta.ie/userfiles/files/50490109425.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/27876871006.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/gogulufok.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/zudufupudobek.pdfIn PDF document text
    • http://citra.cl/userfiles/file/44690270101.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/rujer.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f455fc9e3e25184aa3027876fb74b90a/36847750485.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/70770073400.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fd6865fd---motavulakixopogetokibidow.pdfIn PDF document text
    • https://people11people.com/uploads/File/47008202988.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0cfc14e54---52287978874.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ab1d552f---bosoromirilimal.pdfIn PDF document text
    • http://schokozentrale.de/idata/jafujubagunopogubun.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/t2v6or6h865ovs7cf1b09vetf4/50618198505.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/xajuravimapuza.pdfIn PDF document text
    • http://becucci.it/userfiles/files/zuvurasafumibikom.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15a6d1418---kotasejazuwowenalitefajuv.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/xitilubi.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/4110792774.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/17840381713.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
font_00_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 17888 bytes
SHA-256: 4cdabfbecb79ca789ee99df1f346118a0fbc6c9e0cc9913c0ac46c2da882bb6a
font_01_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 3784 bytes
SHA-256: 59b20c8ce563782a54a18841db383e5f2fd78fde88ed759396bd912de189764e
font_02_sfnt_off00012c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001442d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442D 10756 bytes
SHA-256: 1a1412b32ad33adf04bf6df9a0b414ed1cf633982714265290ab809b72270af8
font_04_sfnt_off00015d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D11 16444 bytes
SHA-256: 80d66d429f20e6a668cf437af2cc80d7cdadabd8adc8d684a2122b204e28a8da

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