Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab4646f398d6ac2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 03:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fed0c901e74d1c3fc6fb26ecde9564b3 SHA-1: 7b27134f5c006842f9ad7ffbbabda11903cb47f5 SHA-256: 0ab4646f398d6ac2c71b66e018b274d155acf17501bbaae20a6a1d8ba034ef10
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=soodhu+kavvum+full+movie+hd+1080p+with+english+subtitles
    • http://chpcentre.com/files/file/xifaxonipulidapazapiwezet.pdf
    • http://suspensionestg.mx/userfiles/file/17905281081.pdf
    • http://hondatayho.vn/images/ckeditor/files/fafuxewopavunojomuwaruno.pdf
    • http://ihdbd.org/upload/files/37171354405.pdf
    • http://st-johnson.com/Uploadfiles/files/ritos.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/41545300957.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/pidakatuparagixu.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161485532491f5---99640207707.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/51764087359.pdf
    • http://kahounova.cz/userfiles/file/juzezabevusagumigileri.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ad06accdd---37885823817.pdf
    • http://qualityspices.in/ckuploads/files/kisaberigekumibutim.pdf
    • http://www.oiseaubleu-promo.fr/userfiles/file/53950916685.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161400e9d8da2f---91753180595.pdf
    • https://amigo-shop.105h.net/upload/files/rurerozijijixexakomateb.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/16765846682.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/i25hu0endlf9kujne0f9qbg9j0/20498319276.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/56363676933.pdf
    • https://rosenstein.lu/userfiles/files/92379706185.pdf
    • http://neoclassicalmansions.com/uplds/file/nogarevufasofu.pdf
    • http://sbs-group.co/userfiles/files/37853200254.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/maxifaz.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/sobivogizozojolamupapev.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7b7622b4b23b0474aa2bff2baee0b805/97106968570.pdf
    • http://tecsun-moscow.ru/docs/file/66471216681.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7a.bin
c6f5b433de7f828d7d1db0503cfdf93ae456f76c50074f78fd3accb7ab73afa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 11784 bytes
font_01_sfnt_off0000f725.bin
8eab09c6a9db2da9506f34400b9e2c4dd4e7f9d796c0b162a2c4fc92a7bbac43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 19256 bytes
font_02_sfnt_off0001298e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 16792 bytes

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