Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40f2d097d1717db…

MALICIOUS

PDF

78.7 KB Created: 2021-08-31 12:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3dd549deadf5f09ee03be43208043e4 SHA-1: 8518c73ed56215732a1d17638f84731011576efe SHA-256: b40f2d097d1717dbeea3064ec541e85e585d7b1578c2dcddc55dcc2405cd8758
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains. The primary goal appears to be directing users to these external sites, which could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://paglialonga.it/userfiles/files/84567193082.pdf In PDF document text
    • http://vidol.nl/userfiles/file/24623372753.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/769777864.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b218002e---mejafivuninukugo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504045346390720.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cefd70a298d---65878525939.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb0020dac---sivesajakemepofoxipul.pdfIn PDF document text
    • http://scpt.it/userfiles/files/dubulatutizuk.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/20231720953.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160edef2b6c80c---28906648557.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/86f5b44f69bfc1c392ef016cec53c1e5/sukurejig.pdfIn PDF document text
    • http://sushibelovo.ru/files/29575621570.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/43768218887.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/perujizujivunegovus.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/95420344070.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b9523e94eda8afd5e65955368f989a2c/63060910914.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b860ecf2da9---26072960976.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fbe808918---60101320618.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b53b754a---xipebulejobuxunepofopa.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b3bf1812eb338f8deda903398b05cb92/lubajusob.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/56368408b5d63918826a6a63a66142dc/47215423216.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d1fb3a01a---danepovox.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/jm6fjf8fnpf94jr8ti8iudc0dn/zekixojerulenotefaj.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/zofisobi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/85290794005.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160862ea12b---20306018619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=commercial+flat+roof+typesPDF 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_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 16272 bytes
SHA-256: 57cbc14a9a405c0821584eafe44e96713247261b5813d24753e477689bd02591
font_02_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 10684 bytes
SHA-256: 05a68a683b8c2394c27ebf6956a51582f5c1ce8eaf23bbc632ccc37178327434

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