Malicious PDF — malware analysis report

Static analysis result for SHA-256 705d9957e137c701…

MALICIOUS

PDF

79.2 KB Created: 2021-07-23 14:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e2386614abc869049f15e7fe5b649b7 SHA-1: fc5aaf73b7e39e0d320958ab3266d69ecbc18cbd SHA-256: 705d9957e137c7013e5b6bb00ea157131ec156d9fd7522bc34166748c00997e1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the file's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/940352da39864a45d4c2325f6c151508/56152557403.pdf In PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/55091955654.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/74831922125.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k2sphka8sprruio9g2hpmal4pm/nigudenazi.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/7006573795.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/8033959457.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/a2475523cf75b0839449982cf8fc1753/65321191376.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/xomovibonodaki.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/504415eab99cb87ed0b3840a665b621e/99064601479.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16088286a9f910---64025293924.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070119000162.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e68ed0edb98ef02c050edd991ec1ec1b/rexiteridap.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803d55489a8---41420925816.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8d80bfb3628e5bb3ef699d8e709e853b/35124038886.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/75474104696.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/putavefutesatozaburor.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/2d86c8d3379859774053b2b4d56f7384/wadetuvevisufabavejun.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210705032747_c0wrdm.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96a3137c0d---64029446187.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mimkebh9hq14t84d6m8lpbumlr/57941921411.pdfIn PDF document text
    • https://ikima.fr/uploads/file/38608776766.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37946cc075---73224670943.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210714_FA9029B02E3F396E.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/sekipukiteno.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1fa872bb---89144792531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nate+the+great+online+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC90 10588 bytes
SHA-256: fe270db5abaf71b0ee8a093098bda41d9da90d2559bb3ce801602097334c4519
font_01_sfnt_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 16836 bytes
SHA-256: 94ba426042eef7b87c327d5e520c1fa0a7102714db218fd466ecccff25ee849b
font_03_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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