Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5d03bb435424a0…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 04:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8337d7f2e5b9ccea2cef11e30887d262 SHA-1: 1727d8dc87968bdbc58b1769b678650262cf2bd6 SHA-256: fb5d03bb435424a09aebc24e9ba24f906e50c67b9c31c63d0533ec167309e2e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicative of a link farm designed to lure users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=java+image+to+bitmap PDF link annotation
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2086da9e207117aca2c504812f4c4730/64457498346.pdfIn PDF document text
    • https://badrivishal.com/media/19805791114.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/83260215256.pdfIn PDF document text
    • https://dalba.net/other_files/File/terurugunevojegumanazawaf.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/dalise.pdfIn PDF document text
    • https://filetorme.com/upload/files/mafakefovu.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210913041111.pdfIn PDF document text
    • https://premium-house.uz/images/file/zilofugimitub.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/29356888417.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210908_875FB6193378DE40.pdfIn PDF document text
    • https://ibextrail.com/editor-images/muxidaxorotetid.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/38863365294.pdfIn PDF document text
    • http://idcla.net/upload/files/fokejudesazux.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/fulogojakixenogozexosubu.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109100314437210.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8d5b4e70---18708575901.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109011812238174.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49ed2a07a---43882139754.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/24965309320.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/50080245777.pdfIn PDF document text
    • http://asfalon.com/__files/file/40816053550.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/0ebc23f3848e2838848bf2fe9f3c7759/raxamotozabo.pdfIn PDF document text
    • http://xsteelstock.com/d/files/xunikififamuridogekejezu.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/viwaborikudenetofir.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bac30d232c6678140f363e4d7ff7505c/wunozetujiminu.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/9230833332.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_off0000b9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 17884 bytes
SHA-256: ae538e5d253b2c5843946885b0d7ea8ec8bbc15f2a912bf86a7971e5035f763e
font_01_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 10372 bytes
SHA-256: 7f8f658449463190fa4ac8d648a2ccb06afb3143935a2fd91b2776a553f4d2fe
font_02_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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