Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c3ca20d94113a4…

MALICIOUS

PDF

93.6 KB Created: 2021-07-06 13:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe43ede30d23cae284d380fd9c0ac3bd SHA-1: 1ba9ecd9b6d4694926fc0168ce25ca0bfc9776d0 SHA-256: d3c3ca20d94113a4e09be2ce8e1c1ec32e22d78adbe63d5badbb23ce92376c3a
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 phishing or trojan payload. It contains a large number of links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or exploit kits. The presence of multiple external URIs and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://tuderprogettazione.it/userfiles/files/65010170465.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cebcecaaa0---salisuxilexogofaxefomagis.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d39488a6a569c174529cc25e3ee9df17/viloxujujasusowef.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/8ie26cg4irghlra1mckh113d07/waxerajibitirusekuguxoma.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609644dbe099f---ruzojujarujebufig.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e93709517---12370792460.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c36deda9908---zufuse.pdf
    • http://africareview.in/userfiles/file/67660653753.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7fab749d20a40d6e40271059b8d3a9f/42962008355.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e882cd46f---nonirese.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab1b5cd94---batetopudixulololax.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09f265620---85567491722.pdf
    • http://bukhatirhomes.com/userfiles/file/mexomefowabebisefuzix.pdf
    • https://motelandratecuci.ro/userfiles/file/86101720932.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5fe09c39---nubuxupufiv.pdf
    • http://podlahypilat.cz/admin/file/84971499999.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/27a65d6428a9c8869af07ab948f765f0/4824210752.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dc131ca6fa490dfe12e2be24cb878237/wonoxolikepopamugaxerol.pdf
    • http://3dprofi.net/images/uploads/file/beveferaji.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/5b8f4136ac28d38fdc2a0c085a6e2057/mojifinebewo.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4071492095---25696489809.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/91135508907.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb9cf80321---45963812243.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609115a152eb7---resavutolozevolalizobevut.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/926def71f43433b5deb37598639433f5/70826349412.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bloom%27s+revised+taxonomy+book+pdf
    • 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_off000108b4.bin
f7b5a406340e90a5781657ce1127764dc2652e0fd9a627278dd2e0885fa77b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 17776 bytes
font_01_sfnt_off00013664.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13664 16792 bytes
font_02_sfnt_off00014e7b.bin
a2075f315b346456db4cf031986c08db81128af96662497a2c8f5c32e3df7cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7B 11260 bytes

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