Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a699bb748f907a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 21:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 106b21272d899b55ab0dc74c952a4f50 SHA-1: 9b539cadd2d0837b09cc75e181d0cb5f3296259c SHA-256: 62a699bb748f907aa176a742e9d492cd2ddf6b56fdaf5b1cf48fa02c10e34a8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, pointing to multiple compromised websites, likely to obscure the final malicious destination or to distribute different payloads. ClamAV and ML classifiers strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://sy-smile.com/upload/files/penumugijemurofatezine.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aqnvmog56ai4dajavidjjrht13/83280007881.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/49a582fb4572e1034a97c5c985da0c47/mizadimufakajuseluki.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/41207707162.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/muwejutekefazupe.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/b5da29n58pklrs1bd851ciuetn/zisiwatik.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7934146a---letilisekaxuxazujaluvojos.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/pasasegojolasasekizexemim.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/adusafosiboloso.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/mifufid.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/266eb4751a2403232136bf599129c88f/dewumetorikexaki.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/26990351605.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56d47114b6---37983164466.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/ginejusuwirizezabowajesew.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/setegofebusetipumeko.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/tawomisizuxoxow.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/8988501287.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5nv4jideg5dsgdpoaek8kdd18f/9712796388.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/tupizijolutefevogegeza.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/kavivukibafufij.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2as1r5djk2esgm9tovlffrvc32/joziregar.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/81744498209.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/18182157548.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051123292386408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=predator+generator+4375+manualPDF link annotation
    • 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_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 10868 bytes
SHA-256: b597f25f1a16651fde82a0d56c120e76294f27faa7d204fab3777b7e5472fea5
font_01_sfnt_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 16796 bytes
SHA-256: bfa2eec84b048780179d678534150d643ee414f130702ff6df6444dc664afa3d
font_02_sfnt_off000116ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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