Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d8d21ea9b1d6c7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 02:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5e3ea4a200c7a357566b328a5509c987 SHA-1: 3277d7cedf15a128a1216c6d1607d93cdd9ecd51 SHA-256: 83d8d21ea9b1d6c7c7ea84f449a2d2cdc85b45dba96aa0ee943b15b51625adf0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to phishing pages or download further malware. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://grouptm2.com/contents/files/kuzolaw.pdf In PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/26102741797.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8ebdgfbvl20qc2dru68dj2pqok/xupibaxozikuvatanovuzibij.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/42505620249.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/gimida.pdfIn PDF document text
    • http://pi-consulting.ch/download/gotafajopemitofuzoxof.pdfIn PDF document text
    • http://afro-safari.com/upload/files/24826189952.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f6bcc3f7d0e8c43189b44eaa0e1564b5/kipebajumotefoko.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210909162551.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/63362533283.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/70491476118.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wawadu.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/18119389765.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bbd54893e---gekakunukinewisagudesife.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210904022217.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/votavibad.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f9961163---48709029697.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/6902789816.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/seruzesidegujaxuged.pdfIn PDF document text
    • https://mcsfood.com/images/file/99861001599.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/dizavigupofosumamaziluvi.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/lunozilozaj.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/2904462531.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/72283050972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+retrieve+deleted+messages+from+androidPDF 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_off0000d2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DA 11008 bytes
SHA-256: 0bd3084d7cc58e095f72c5bc2a9307f0cceba22daabe2f7b840f3e823aea1185
font_01_sfnt_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 17340 bytes
SHA-256: 600e4d64065bb581fc768984ff3b683e910df713685c4d5a435a5e96476b973a

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