Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c870ba8ce634bf…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 18:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: feafd0204bc301b87fb47dad3727fc96 SHA-1: 20eb77978761ff5c647ff23065db11606f26336e SHA-256: f7c870ba8ce634bfda1792ef2d3729113d4057ab4c7f8dd96bc9c98539156cd5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to potentially compromised or disposable hosting, indicative of a phishing or malware distribution scheme. The heuristic firings suggest the document is an image-only lure designed to trick users into clicking a link, which likely leads to a malicious payload or phishing page. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453f7ada316---16253737751.pdf In PDF document text
    • http://ejmk.com/ej/upload/files/fupugoso.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/denolaj.pdfIn PDF document text
    • https://ccskin.com/geektic/files/7641536285.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109161722485132.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410acbd0ce6---1780591337.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/lipoveret.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/gixulosali.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/zifedeludujexezifagu.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/73437150727.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/85085239241.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/20138013348.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/zigejovevivobiwu.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/jokukikap.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/16236441208.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/65941392885.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/81849784149.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210908041838_694y8h.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147628063c7e---kavuwupi.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/89161832047.pdfIn PDF document text
    • https://luminex.pl/upload/file/ledoniwipuxim.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/rusexibigej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=go+launcher+apk+proPDF 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_off0000b090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 10344 bytes
SHA-256: 4bde928a74514d9bdbd17c5e4c4c9cd870ff6751cc29fb4e96930466f151703f
font_01_sfnt_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 14384 bytes
SHA-256: 6c61d3b53a334f1a11e5394a5cdeb85bb1f72e9e216e2a64f490635f96af8d0a
font_02_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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