Malicious PDF — malware analysis report

Static analysis result for SHA-256 770f300196056a44…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 02:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a1adf24f0a757d8d032fdce58ae2f727 SHA-1: ba88c8583f64d0b2ba9d9cddc4ac69d8f7fcc76e SHA-256: 770f300196056a4455b69626cca95bebf19f32a41449636c2a1890190d48185c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. No scripts were extracted, but the nature of the URLs and the detection names point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://ordinate-ltd.com/file_media/file_image/file/42438172921.pdf In PDF document text
    • http://shopcode.ru/uploads/file/wakozumunujomadetowaxazu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/58115088655.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/83356393519.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f389f3097689a0149b7e755f51e4c344/89651630748.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6517da48---lopigajupesezobi.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/gefevevoxen.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/sepopefugafaxogimiveremu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/18723113003.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/25337563448.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ee740faa7b50b6c5d862b66956a0b6aa/83407570008.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/muxogenaniz.pdfIn PDF document text
    • http://banquat.com/userfiles/files/bilosapuduwev.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d0da76b2bb6ffdbc8a05e79082d78441/xeliguxaloxiw.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/79042852287.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/14695894950.pdfIn PDF document text
    • https://equinox-e.com/upload/files/xavatalupagukidukawop.pdfIn PDF document text
    • https://red-adlay.com/upload/files/bijozodofutu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zimuz.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/barunufesizipixoramox.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/82623382722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vikings+reading+comprehension+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/12a507105a3087423908d8b960450b58/23131963768.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_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 10984 bytes
SHA-256: cebd52faeb94c531dbb05d20d66e880a824f36e8f2664639e2bca987c0dfe59c
font_02_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 17868 bytes
SHA-256: 6c71f12ffb7d71d286bf4495cb2450527613a8e346e923aca06ffe5ef208c04a