Malicious PDF — malware analysis report

Static analysis result for SHA-256 4818e121d56dd059…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 08:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ccfafc1f11f770684e51d8ddf914816 SHA-1: a89c7b8ae01020f3dfc7b985d8aaf3405fc28c8d SHA-256: 4818e121d56dd059c3be6ae109b1388739afef646a8b6513a91d49f5415a9d00
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URIs and the nature of the heuristic firings indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/0da0ac724fef8e88d0d382871b6a45bb/xivete.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607205f648433---konereziwusamojiduxo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c253e766432---mesapowefinadamizekorad.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d09430fc67---43565605201.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/setemevukomadejutexowuku.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a600c2809---bitonanofinuvibizerax.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/88492935868.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606df8ce71bcb---dufatonop.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/likodudi.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/65277559435.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819a8ca464---lokabodifijifuvegoxe.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821429d110b---fujozelilowodexatuf.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5cgtm7h5ff5p1p20fh717q6jt4/72131921574.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/gidajusinavexuduxisebase.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/libalixiwumuniluso.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/95qrtanukisb982fqik516urpc/65646693089.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/likugagofab.pdfIn PDF document text
    • https://stopserv.ru/files/file/linuwoso.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8893696e5b---65219059271.pdfIn PDF document text
    • http://isvpro.com/custom/files/36166770849.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85c2d74ee---dadiribikoxeluwiv.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/62880161909.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/68624598734.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/wijuvegimugafut.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/5e6g7llpikl4h6rocsb2ct4je7/17615533470.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/jumut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=humidity+sensor+types+pdfPDF 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_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 10656 bytes
SHA-256: 9f4fcb35f81e62f7245bf65f87a37ddca09b153fafffd867e007dab32d3907be
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 18592 bytes
SHA-256: 3317ac2b85b9428bcc8f5533948de8fc4bee0d3824c9c80fe5087dca1e8b143d

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