Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b7df5d6844cb1e…

MALICIOUS

PDF

95.5 KB Created: 2021-07-06 19:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 066aef0d163ab2634d3b80c64e2c0f1f SHA-1: c16da3d49d94ed69b039f96a0a61ceedeef68a0f SHA-256: 30b7df5d6844cb1eec4cf1c61ac617b6420c67fdd24c440cd7f8fb008a9093c2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://portugaliaimagyarok.com/ckfinder/userfiles/files/mitij.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2257a0f9b12970231fd2f14491acaa71/76374805614.pdf
    • http://webbuilders.com/files/file/67532065956.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e600c8196---87604403403.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731194dcf8e---86681741369.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3924645cd1---mapafezurijupawudosagusu.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3epvpff3jc7un2boabfvjdeu27/53131073667.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607949f3b9e9f---bujameraroduxabozeriniku.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6rv2k1h7qfhuubv559u33edkvq/wekadazabewizajexajuxovov.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c33af198---84511831777.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/34e685789159955acf76428bb666ae62/15731452742.pdf
    • https://oddluzanie.net/userfiles/file/moxunovozobe.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0f8fa94be449aea3519c98582a634ae9/77395147187.pdf
    • http://volamtuyetthe.com/userfiles/file/61754504236.pdf
    • http://nicenpos.com/userData/board/file/65973795191.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/447b58c2d3da33138d1d9ccf3e295ffa/68150650740.pdf
    • http://billsky.ee/files/file/18487976038.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d5a85bc21cb942399540acce93f6a968/ragir.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/79003156204.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083efb86d23d---fedizilutuwapitenizanidug.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b02afa71d31---vafikekam.pdf
    • https://angelsstaff.com/uploads/file/32640275683.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+level+d+in+reading
    • 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_off00011370.bin
8f7db876745cd6c2f363641777b6bc1c07c5e6886552ee1f6d58f0e10e449d10
pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 17436 bytes
font_01_sfnt_off00014185.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14185 16792 bytes
font_02_sfnt_off0001599c.bin
2131223d5018dc9569c3905a6b1521ca9c20400a6ed4f30415be9f9777d90342
pdf-font-stream PDF embedded font (sfnt) at offset 0x1599C 10464 bytes