Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d3e2caf2cba20c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 04:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a596d0a8f446e1c5344d48e1574dc5e8 SHA-1: 8c7809876f9869a034a483bacb573af2771a37c8 SHA-256: 30d3e2caf2cba20c8a614521f16f09905fbe576fd8345b2a88a2eea301083ad8
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=fast+and+furious+8+full+movie+download+tamil PDF link annotation
    • https://efficimm.fr/userfiles/files/soraxod.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/27333555013.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bc5276712---juzexuvifesesinon.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8485911721.pdfIn PDF document text
    • http://insei.eu/userfiles/files/tizowunifosoxagetukuxu.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/51867865820.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/akao58j56p3p4dhd3au151v2gl/43671478396.pdfIn PDF document text
    • http://methese.com/upload/files/69472380712.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614441b5e2b70---83861696240.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/radisodokebovotofibivu.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/197614808.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/18219129014.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zewujoz.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/risufapasejosoza.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/20347979735.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/90333276136.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/debizijonesezejebuza.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8c89bed1---wuzovu.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/54911560638.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/funejitixer.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vavupomuvigejafogebumiz.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210918_DBE23BBD78324DD0.pdfIn PDF document text
    • https://schmitz.cz/res/file/lekolajateto.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/demovevixel.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/efc9de2b3bc54be9dab20e893b8c4fea/purifaxupezusoxug.pdfIn PDF document text
    • 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_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 17836 bytes
SHA-256: 77106bbcd6893023118fef0dff94ffabb3567b9f62064e1836d385bc6af104c5
font_01_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 10952 bytes
SHA-256: 7c170e86d8d418ea0bf28ded75be779c66cf5799c6faca412d56c446c1e50d7c
font_02_sfnt_off00013317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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