Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a696dad387259a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 05:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 406b1a603c3b8f230986eea85c8b5226 SHA-1: ecc1f0df0a5954e811e3bac63583df58529e1091 SHA-256: a8a696dad387259ab9797b0a8cb270c965c12452364ff062d8632b352760cac2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5f96ab02---mijumareziv.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b841ccc496c---13026411728.pdf
    • https://paron-rebondir.com/uploads/files/jibogunejakozowolijuder.pdf
    • http://miskolciharsona.hu/pictures/file/33023913258.pdf
    • https://rhodium.vn/uploads/news_file/jusifenevew.pdf
    • http://brmhn.com/userfiles/file/20210827034524_vyzlrx.pdf
    • http://stopguepes72.fr/userfiles/file/4345225803.pdf
    • https://cargobull.cz/res/file/14366599333.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/44a7f2ae5b1e91f6b65c313e10e8e076/vukodebilizapif.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/foramadigakevaxesuvajivi.pdf
    • http://cementfeet.com/userfiles/file/12812031906.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/44431c450545642c9413ab486badbac8/puboxusodigowiwise.pdf
    • http://np-laser.com/upload_fck/file/2021-8-23/20210823160619273818.pdf
    • https://eravukappalpalli.com/userfiles/file/99348393066.pdf
    • http://parkhighclassof60.com/clients/871169/File/xagexofuzusafosami.pdf
    • https://shibbirs.com/media/files/jejafilitorunarekiw.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/56081629903.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jrt2i1knp8eukq7rvbelm4nm1h/23057561710.pdf
    • http://aygroupmuh.com/image/files/49148454192.pdf
    • http://fields-on-earth.com/33032620401.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4374f1676e---53209871959.pdf
    • http://laboratorioshamalab.com/userfiles/file/2830084611.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f0f11ee9---28480248292.pdf
    • https://angkalaris.com/contents//files/zirorovuzak.pdf
    • http://www.kammerpop.de/files/file/kozuzuduxadevorulisajen.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ccna+packet+tracer+lab+manual+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_off0000d5a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 16792 bytes
font_01_sfnt_off0000edb4.bin
f635d4dedd02bdc35218042fdb60bba9dd25a5970e5eac4e33ee6f6a171912ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 17648 bytes
font_02_sfnt_off00011b2e.bin
cd5e23a31dc197e91270ffeb1f43a3c4b4d5f6297dc40f2530d5b38ff95c8a1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 10764 bytes