Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86d8d485f0fc1d0…

MALICIOUS

PDF

97.1 KB Created: 2021-09-09 08:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2097618bfde79017cd4afd2d546e18a4 SHA-1: 9085e9c22a6bea7c591a01f5ce9916688173d686 SHA-256: a86d8d485f0fc1d0ce7572f7d1037d397d8d72eaaf7f672ffad8df63b78ea7b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of numerous links pointing to compromised WordPress upload directories suggests a link farm designed to distribute malicious content or facilitate phishing attacks. No scripts were extracted, but the overall structure and URL patterns indicate a likely attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161332fee6a48f---nujavek.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd41bef43---ritutagixolurelunemitiwa.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/zadikixesipemofagozexijub.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/kisizolituvotaza.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/50328112296.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/jivaragi.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/19095580992.pdfIn PDF document text
    • https://duel.pl/userfiles/file/befim.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/jolavadug.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeae3c9df8---59627895392.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/xepexakogawufewitumuforo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b6659ed1---sutigatobulowejukuragow.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/10327368931.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4a51610016aa95ae1752ceb0171e039f/kamoju.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/kewibagoxosunomin.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/lazedom.pdfIn PDF document text
    • http://scro.ru/pic/file/jebijosu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6cb3c3cc---72759305384.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/54800493583.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/tixidetek.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/21368225395.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/zudikuvadofigomepizenev.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/84488668047.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/mevijefososukukat.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109050732363015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=naruto+shippuden+2PDF 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_off00010d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 21924 bytes
SHA-256: ed62e8254e321f45433e173b44829d4591558b6b8e524f487501f6ccfa51608f
font_02_sfnt_off00015e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1F 10640 bytes
SHA-256: c7d0b53db95f696a018fb8b78c7520db770f9a8475219df461403e0d23b7ba05

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