Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ba04ec6e91c0c4…

MALICIOUS

PDF

101.4 KB Created: 2021-06-26 06:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1033bfb04749595411a5ee88cc9a0e18 SHA-1: 0d904568062ee32a64fac086c9313fc836f69821 SHA-256: 98ba04ec6e91c0c4fe73aecf30b4e182782ec40b14e932f1bca225101f4d01dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fb1c713f1b3213445b3d700d7fe4bd25/nirijalogabivukata.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083a91f75021---43000120876.pdf
    • https://waroproject.com/file/lekoli.pdf
    • http://pwr-tech.ru/userfiles/file/faxixamopuzozijawo.pdf
    • http://ibb-online.ru/f/file/66969559267.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2b28899d9f31b4b95e09ce4b9a54d209/14178740649.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc13454e5c---42004556308.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf27df082---dovututemixo.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099d5d8403df---jejoxutosiberagare.pdf
    • https://maggies-handmade.com/UserFiles/files/31347022850.pdf
    • http://geteffective.biz/uploadfiles/file/298364444.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cn0qu128rvidlqikufrgk82r7/92226014660.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p210tn72b4o40c5b25ab4ug2l5/jekovojituzixutibi.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0d0b2455e790844b4993b76d0553af52/74261402513.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e0b22e6cb---pavigamimibugibizavaro.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87e84e450d---98391960507.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0113cfbf---57311418884.pdf
    • https://scriptdd.com/_file/file/lemigizaje.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/34869391070.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071a24879b55---83670143089.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b027863f5---86875420364.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/gfo639b9tresckfi3f4hhjhbf5/situgelebugitelidon.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/41399501962.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3834fb85---kupapixajulijajabu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=south+pole+adventurer+ielts+reading+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001111b.bin
6343ce6acb2a0edaf32c43c613bfccc550ba115101dbcd5f60e5df83657df582
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 10996 bytes
font_01_sfnt_off00012a73.bin
fc76a6602be6fcbfd1ef3c7fb23bf0fcf78eb78e29a811f29812ff96ee2beb81
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 17552 bytes
font_02_sfnt_off00015823.bin
cdbd3ad822f10429e15faa68ad63b41718728d414a1ae4f08c4b339b5e03a8df
pdf-font-stream PDF embedded font (sfnt) at offset 0x15823 16612 bytes
font_03_sfnt_off00016f99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F99 16792 bytes