Malicious PDF — malware analysis report

Static analysis result for SHA-256 535f9799559807f3…

MALICIOUS

PDF

139.1 KB Created: 2021-06-30 04:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2b461212ffb76abad769395529036fe SHA-1: 125e4e4f344daf80717a829eca2ade644103a53f SHA-256: 535f9799559807f30f4eac86f1d73aa6f790540668aee0f7bd0b14d0fc076ef9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9007

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://dolcezzecaffe.it/file/45072052487.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88c843d991---31886327868.pdf
    • http://dichvu12h.net/userfiles/file/juvugatizupuporepujowaz.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/kr9m95omfd6rpremnv8emc7fgn/xusejapogile.pdf
    • https://mvpartners.be/images/uploadedimages/file/guwog.pdf
    • https://anfauglir.com/images/file/lujosejosegot.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7ej18v1ba9umhh06dmnp4qqlou/polejexezolemedelavenip.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b05d1234a---55046174949.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/afd8a772d1d15ea85f76bef784914f91/jobiguwosesexezeku.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2862ae7d14d193c0ffb5c6306d3ceae3/83652885095.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2aacbe02---89565404913.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10bd35d2f---25249023460.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/idv7650ipjgrdvgcr23ccjla83/68957888654.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879124d76a1---60240832866.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8dc511056---21565613223.pdf
    • http://profil-metall.de/content/uploads/file/wikamelariwog.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/51813302299.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99ed927b5---70697875292.pdf
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/zuvex.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160867df925845---zusuxeninivudarugosakuf.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qcaunr36vgn689cja6f7581nq5/folumuvutejuvoxokazosejuz.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d197a30bc5---vekedo.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d6cd485ffc68d56ad09da4f4ba270f86/bopavativopapukuk.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa12ba192---dipabosovuxave.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fill+in+thesaurus
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001c491.bin
5966d2215f6a2bcac0f82eb99d434794fd5e97761ef3a6aa021dbc30eb486297		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C491 34744 bytes
font_00_sfnt_off00012e14.bin
9f3bfdaef5575992644e19a0dbfe8d7146d8b410c0e8323e2d55740e49e93cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 10160 bytes
font_01_sfnt_off000144a6.bin
2b4fe79973caf2c59b1dadf6d089945a3982fff5c6b9a2f3111e7ac98a9d2ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144A6 17172 bytes
font_02_sfnt_off0001777b.bin
e6050c5114302fbc2e64be9f947f79db85a2d75d32f027a9ef4555c3fa93dec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1777B 35980 bytes
font_04_sfnt_off000204d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x204D8 16792 bytes

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