Malicious PDF — malware analysis report

Static analysis result for SHA-256 620de2c555d7eeed…

MALICIOUS

PDF

78.6 KB Created: 2021-09-23 05:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10f99fe38862525111ebba87b5a1da3f SHA-1: 013b4ef03e0e8a8b3ef52d406173cb74944c3dac SHA-256: 620de2c555d7eeed1c953c35b069d79d6c5e11dbd8bb5079b3e696376a8fc680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=echo+show+8+apps PDF link annotation
    • https://gfwofficial.com/ck_imgs/files/xasubef.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/25333907398.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/3773109165.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/757856444.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/22286471152.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130592b21024---16486948276.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/kagulapuvofejinisalarev.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd52a76886---78031077777.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/jekaf.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/199462d3b6ce28b30f634de605d41cbe/25441030341.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/6819282282.pdfIn PDF document text
    • http://air-con.ru/upload/files/49738280010.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/sovurijuxijepenodikuk.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/wafewirupirag.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2b832e2c417de522cbc65bd1b694a5c2/76193715368.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/jogugate.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/88845479721.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/lazibopegamonagabalamam.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/guloravalofu.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/61394590872.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/37500791069.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210920114848.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/66676144406.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gakfihhihv265cgqkkhb8lihmd/figikovagalofamuxanujux.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6dabac036---wekikofa.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_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 17556 bytes
SHA-256: 4e589e668596b33d43b2b44caa4b8481a1404dacabb83e9ac835b62a7a89bc61
font_02_sfnt_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 10176 bytes
SHA-256: b4a16f35c18b4b9c15662409a90609f2008d99dc8014fe0b28f6f33e8e1d0b5d

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