Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed34a4e14dfe91c1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 18:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30fdcfd6f9235c18614dbdc1885c15a5 SHA-1: 47ef5b7e480c71711fe32f414befcfcbc403856d SHA-256: ed34a4e14dfe91c1d9ae26bb7a41ff0d2e5274301979052c4db8ef5df672b280
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. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of external URIs and compromised CMS uploads indicates a likely multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab71ca836---radasemovin.pdf In PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/gumufiwurakunaxa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609298e5d4dbe---wiwodufawotovoxevirozij.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/zusexerixa.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba7618c74---31077789840.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/nabutudamadosavu.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/33246239092.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/5093780988.pdfIn PDF document text
    • https://polandpools.com/contents//files/bekanijup.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/71046921014.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/vaxarukutuwagukujiku.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zowusigopitaxa.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/52773561574.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/buwuwojosipobebunipe.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/kuwixeruvuputikukigamabir.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711d3c1d3da---fojokalizowajonuxazu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b172b788b---fumaxafupo.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/nokekavumibaboxemijozutit.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/lmn026s7ldj9dsum2q0151jqui/dawigiluna.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/40465054441.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/zovagadoxawupopu.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lizuxipom.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/75745100345.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ree2p87ffga2v4u3b0vonpg209/98683498945.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/76758259648.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/47273709429c724de4e925dcf93c6847/73504990663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=experimentos+cientificos+caseros+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_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 19732 bytes
SHA-256: bdf519a9da99f3db46997cee3ee66dac557496e8be9c2e68faea3d8acfc38f9d
font_01_sfnt_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 10820 bytes
SHA-256: d5908194658c5e77f0a0a91e1bf591f32d8c3e9f9c5e7e63c02abdc00ef16583
font_02_sfnt_off00012a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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