Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdb346424cba6b1…

MALICIOUS

PDF

105.0 KB Created: 2021-08-05 13:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 04ff3f38d262b0d3607379af4e6686a1 SHA-1: 5a800bcb40905eab697c1c1c007cf27014f01f67 SHA-256: 7fdb346424cba6b1257655255881ffa58c919833e47a9781f6c445feae6cbd53
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=shia+ki+namaz+e+janaza+ka+tariqa+pdf PDF link annotation
    • https://biovuspharma.net/userfiles/files/lusugez.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7f3741f7195f78bf13533faa8d554b54/kesulejanabuzuzum.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072707d6dbc1---gofufuvogobikemu.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/99200848059.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4abc0ab8bd---31656561982.pdfIn PDF document text
    • http://snft.ro/media/file/xadibuvutodebu.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/lowotirumemo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6f3edea1---31515627668.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/15715777506.pdfIn PDF document text
    • https://hoongnau.com/upload/files/73409806486.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/pekokamofojupidolex.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c573fbe000f---nanujopabitibijekub.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/xedakotaginugigegelif.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4gea5v1i4mi2cm0kbgghh0f8ko/67694030771.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/okc1cigulk4i69k9bbrukn1ngu/8178313630.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160922c61c15ca---tomavupuge.pdfIn PDF document text
    • http://furniture83.com/upload/files/mopov.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/7075298052.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3fd7ebd6e2847c3525bbb23c2bd84912/jevimonopugebaxex.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/77708704557.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o2p257d2eonheprqrsrshcamq4/27344782935.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/makuri.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/089s38e6bo5scharisfkg2t41r/babutemazunodew.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6df746593f660e905fffdcc788639204/70032846303.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011d2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D2D 27456 bytes
SHA-256: 51d30a49fdaeda92c18c1e99cea9e52248c1ab76bb246f150657cc38fc153a23
font_00_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF1 17992 bytes
SHA-256: 1c580fa82078832f81a35eae27474325e83b766def2e226afac220740c61d9c9
font_03_sfnt_off00017c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C43 10932 bytes
SHA-256: 6fe6bc173b1a3ba02cb91301c6fc560e644139c183a090abb33573af382b8f60

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