Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe458240b58065aa…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 17:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: a5b28e64f51587e28bbd021b80f60f14 SHA-1: 4e6e351f6a7606eb5b38941303376b7cae5db48b SHA-256: fe458240b58065aa4e0ef16c676df0cd27fa14af236575279ea8c5f3d63ad1f9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Several heuristics indicate it's a link farm hosted on compromised or disposable domains, designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to a phishing site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://tatsolarlight.com/uploads/files/ninetutopesupexofifimoxe.pdf In PDF document text
    • https://tivirtual.com/userfiles/file/47846424478.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/jisupitijofaxovifobizu.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109101044099444.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/00883de4f838b80aa9dffc2b1b08525c/29816338533.pdfIn PDF document text
    • https://path.mn/userfiles/files/dofusonuxebekumen.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109301309207160.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/damoliruseboloxujok.pdfIn PDF document text
    • https://soechi.net/userfiles/file/mapemuzowinawepaxo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da2b97d6d6---jumowakukulukewe.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/kanaberulabigala.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/muxen.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/davozikigufuk.pdfIn PDF document text
    • http://shopabrang.com/images/files/zijidasukobes.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/16832652994.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/49780793248.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219111019143928.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/58297748558.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/17020119730.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/49767590294.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/44121665175.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/44129586973.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d6c9f0eb54dd56a69ee4ec6855084653/83877803090.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/83735005892.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/laxad.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/lofejunepeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=puffin+browser+app+downloadPDF link annotation
    • 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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 13880 bytes
SHA-256: b33143db7343b12d17a64a866b116167c874ca835bff484778bd7f7483f55643
font_01_sfnt_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 10720 bytes
SHA-256: 72642eac4837028acd71983196756d2d33334a3e4506cb7ba6cb9770050a0cec
font_02_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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