Malicious PDF — malware analysis report

Static analysis result for SHA-256 a070a9f935a749a8…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 16:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0859930c184044218461d2e67d48f7c4 SHA-1: 14faadcca8c1c69858eaf84c825a52707d0d49e0 SHA-256: a070a9f935a749a803646671681c12406b0a40804ea3b3800cc08deaf7ef9824
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, it features numerous external links, several of which point to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript and external links indicates an attempt to redirect users or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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://aow.infogestnet.it/ckfinder/userfiles/files/wusixuzute.pdf In PDF document text
    • http://fullerton.kopanramen.com/uploads/files/1758447175.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210902122310.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/lafitunuperodel.pdfIn PDF document text
    • https://wrd13.com/force/file/39346353655.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1e5acd955---87039916886.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/47958497242.pdfIn PDF document text
    • http://canadianrockies.info/files/file/fagiwinefujaj.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/70830552569.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/44823350703.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631557683hAgu.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/83808623915.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/nisubin.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/zejuxuzo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130ffad61471---kiwarovo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614683d9adb50---weloxozogugiguti.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zazerezufasagomaxim.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/lopunemi.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/42911528890.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3491663f68bc34a23f3654aac2d9a773/49544144316.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/51038820119.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/76282509540.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/jekezawajan.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/toravebifafojiwurewinanaz.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/27627083924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+move+data+from+android+phone+to+iphonePDF 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_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 10692 bytes
SHA-256: 58d734b0e0f971aee948ed95aba823c95bdd0ee0da5efa7c93a4799d535da457
font_01_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 17904 bytes
SHA-256: 9ffdb68cafca2bb4dca895a1a79f82b6988a3a70dff00a001b2b94a6c3812733
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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