Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9ac3c2cdb30faa…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 06:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69eef0f20721f13622d1ad8a0a35a5d5 SHA-1: 2290e414f71b40680d5f9d04a2bf6a0fe7e85b16 SHA-256: dc9ac3c2cdb30faa4728f7e469fcecd23822665e6d234649390ef8a310f60665
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users through these links, potentially for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ec83cbb51a61a327a77eefc7cb33d83a/78509691433.pdf In PDF document text
    • http://snbedu.com/uploadfile/file///2021091100174146.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/zemekiweduzerevovezo.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/nunugebinaxazavuza.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/60125017457.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d146df5c---mimavabilejupu.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/nowopijoko.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/88114461864.pdfIn PDF document text
    • http://domosplast.hu/files/file/83350472484.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/taxomezoxugobup.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/wereborebagapafenedititew.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/g3dco727n8bplv1bvkm5rgtgu5/74072636270.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/venipu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/lifido.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kirufinipagugomaxe.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/viwovasib.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/xidekoraroxofisizele.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132e42b27eeb---12900499350.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/maposugefulutujilozur.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/ridokixupabiluj.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/87449832351.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/55080630165.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pexurenetekaladajikudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ridmik+keyboard+for+pc+free+download+windows+7PDF 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_off0000b529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 11208 bytes
SHA-256: 080cda98ab93948e1e0cbc320f4cdc9d6106c780fee2d0d8049bf61cc21e70a1
font_02_sfnt_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 16336 bytes
SHA-256: b1f9ad61fd8c4e576b5d3dd39c817cc1e52e5d2a80bf1d9dd0f467827cbb1746

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