Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e14aa7b77669c8…

MALICIOUS

PDF

68.5 KB Created: 2021-09-17 01:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ee1c6da43c156fa1f6f699bcda79de0 SHA-1: dfc20b4c682adaa1801dd8985f877de6d36828b8 SHA-256: 73e14aa7b77669c88fdd5186aee2873a78d47b9b0ed405951c33cc276be0606c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by an ML classifier and exhibits characteristics of a phishing lure, including being image-heavy with a clickable action. It contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages. No scripts were extracted, but the overall structure and URL patterns indicate a likely attempt to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613746179542f---vebuwuxarowonulugubil.pdf
    • http://ttmplus.com/userfiles/files/pegamujiweto.pdf
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/tujexi.pdf
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/81092586697.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/1313680766.pdf
    • http://jewelry-shopping-city.com/uploads/files/202109032337512829.pdf
    • http://www.drivingschool-brno.cz/files/files/dizibefozuritelev.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/tiwamorar.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/58392542694888407eb92a64dc44c1d7/13807602554.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/garav.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/50980272353.pdf
    • http://klawiatury-foliowe.pl/_data/file/zelebibugasonitir.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/fetedukiw.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3miues3ns8vs6urebqdki3i7s9/xikuvujosalukoxajekefoz.pdf
    • http://turnwealthy.com/ckfinder/userfiles/files/22233334464.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142290b2fb70---58611166325.pdf
    • http://drcleancenter.com/uploads/files/202109151957206066.pdf
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/wajotemo.pdf
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/9967174720.pdf
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/99054717963.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fu414ik6e8r4rmbo2iosbb0955/74630522721.pdf
    • https://brincandoeaprendendo.com/fotosempresa/files/pubemafipumafetakivexun.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4880669b9---68212904402.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=transferring+calendar+from+android+to+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_off0000b073.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 16792 bytes
font_01_sfnt_off0000c88a.bin
cd6bb10506a91218b982cb9b9b07b5334cc02ad145c6a1f727b50e01e5126a33
pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 10780 bytes
font_02_sfnt_off0000e124.bin
9dd131ecaf7e149194a161871b47fb766729cea8e5abf7fb5fca7bdb0854188e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 14296 bytes