Malicious PDF — malware analysis report

Static analysis result for SHA-256 7933274ccaf48f54…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 17:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d59affa4ca42fb22e48b562194e2b03 SHA-1: bfe5b7d10900a49801fd694e5bcae775760b02f8 SHA-256: 7933274ccaf48f5460b329e9a2d6c1d8a3e59b39b3db350e5df1294bf4dcb04d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=imessage+from+ipad+to+android
    • http://ogcdc.org/uploads/ck_upload/files/12037209878.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210925_000943.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxin.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0a8d6a6680324c118b91c14d72313bc2/xivokuveximu.pdf
    • http://nfrostov.ru/upload/files/lewazag.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/lileguwopopotilekuxewa.pdf
    • https://satbietthu.com/luutru/files/guwevejilotozulime.pdf
    • http://moristas.com/userfiles/files/66927451919.pdf
    • http://assytekservizi.com/userfiles/files/52555118995.pdf
    • http://2222.netsociality.com/upload/files/64603686822.pdf
    • http://moscowballet.ru/userfiles/file/92029375594.pdf
    • https://anpheatingandac.net/nbloom/fckuploads/file/bafupo.pdf
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/xulabufamusijuval.pdf
    • http://sov.tranovice.cz/webpagebuilder/ckfinder/userfiles/files/dusivonutamazotezokor.pdf
    • https://it-remarketing.pl/app/webroot/media/files/wixunogevukexuniv.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210919_77447E370678C473.pdf
    • http://watthaistuttgart.de/userfiles/file/tasupivodute.pdf
    • http://www.companyforte.com/imagenes/editor/file/tekepupopivavuzodo.pdf
    • https://bunyaminerdemir.com/resimler/files/zomejuwolivufudabobuzu.pdf
    • http://ducthanggroup.com/webroot/img/files/woboburutijenupe.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d4adf6718eb3205524b97aea77ec1b6/1501491950.pdf
    • https://easy2ticket.com/upload/files/zoxabor.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/eitnh2pv6dpkcgvu2vt2r6j7vl/mujizugasiz.pdf
    • 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_off0000b094.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB094 16792 bytes
font_01_sfnt_off0000c8a6.bin
3014600484d2b1226c33a1e32801e62625969fc3dea2e8a2420e962fe9428afe
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 14620 bytes
font_02_sfnt_off0000ed5b.bin
fbbe746292a0d5d55a6d9c8e35896dddb5ab54c47327f4f8e7d67f1bb55eac1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 10748 bytes