Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aecae31a23a720d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 21:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bd06ce1e59a49bd99e5853fb8f1698c SHA-1: 3f9057c684cbcd9b4edccdc841c213e590465094 SHA-256: 9aecae31a23a720da033412ec164f18a2c68354270346d8a13fe391b94b6003f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm with numerous URLs, several of which point to potentially compromised WordPress upload directories or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • 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://packturf.fr/files/podak.pdf In PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/xogisilofusirezewulekidi.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/femirosadesuvaziwap.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/53614723327.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/41772067733.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/967e402d1afe80c2b4276ecda47df95c/3846356039.pdfIn PDF document text
    • https://songhongresort.com/img/files/vujopoziles.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xubal.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/2823615598.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c425deb336fcd4daf5f9bd9830c52e65/tamozapafalawur.pdfIn PDF document text
    • https://jurad.eu/files/file/wosepuxolavunupapug.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/71871637392.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/zimitaw.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/63748943029.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/lumabuzaxaruv.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/bumazedezarukifapusanesu.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/ratewagozaruwav.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/85826334185.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/81510549479.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd118f7a8---36356271230.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xazejinifujosejawova.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/povegopozedodijuluru.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38e70c028---wivuwidikogifesovagiser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=joystick+for+pokemon+goPDF 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_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 17864 bytes
SHA-256: 3558d80efb46d9b7a9e8c8ed1080ca4fc105cc273c0b75ec4be64581f055832b
font_01_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 10812 bytes
SHA-256: ca4bd3d9cffe6ba9bfa6f838989e288e07a00f576fb126bb90702374d680e439
font_02_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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