Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a044c1570c1dfb6…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 14:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 512b0a14122619322dae6e175f439da7 SHA-1: 58815a80b8d319e9bf2f341788557eba7d1146ec SHA-256: 9a044c1570c1dfb66ae997cc218ce3861b49806038039b1de0eafd456e34ea26
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to PDF files on potentially compromised domains indicates a phishing or malware distribution scheme. No scripts were extracted, but the structure and heuristics point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://ahkjt.com/upfile/file/widozojetunudisoruwaxoti.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89a58088f---lowapanetejufageguf.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4411bf38ba---38176089675.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/7ffe4f798e059446019d940c3ed6c38c/bafinalaberujujar.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1hqephg3v0spdru1cjsujngois/31165740575.pdf
    • http://tivatijapan.com/uploads/userfiles/file/24144485375.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919c933e2c5---doriwefibifela.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1951f2f1ed---ropibonematu.pdf
    • http://pappteam.hu/userfiles/file/wiwunufekasa.pdf
    • http://bantinnhadat.com/users/files/zubobapomazigategiwe.pdf
    • https://edusfera.pl/upload/file/dopogozeva.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37f05d447---49234681396.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8f70fb32---xafuvuwanijuku.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/14454764984.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/fotug.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9025681f1c1163519a055665131869ec/kuxofukudunaravabosat.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf503c393e---tutozuwebovunuwerulag.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/winobi.pdf
    • https://aronabritcan.com/userfiles/file/zegokipit.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab03c4020c---46860531725.pdf
    • http://architettogherardi.eu/userfiles/files/83215489924.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ebe87c5aa1620666e55e8c0a75442080/tijavinabopunilukopa.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/20074425453.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=most+powerful+photo+editing+app+for+android
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f664.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 16792 bytes
font_01_sfnt_off00010e76.bin
b617a531fdafb94bd463e86ed839450951a38683026b4a98a09fef18095282c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 16556 bytes
font_02_sfnt_off0001399a.bin
474c4e83213fad6e3f6a480467356f098a49c9a054d1f68f9f4004cb00f1c35f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 10956 bytes