Malicious PDF — malware analysis report

Static analysis result for SHA-256 720d6fedc566a851…

MALICIOUS

PDF

89.4 KB Created: 2021-06-26 22:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2299e6455fd9de328afd6e8f230b2f22 SHA-1: 52040b4766dff181a9bed9f70599c97c2f93fa84 SHA-256: 720d6fedc566a851b03ebfe763d7c1aa4f9f897d27bd8b87476eb6415e268b97
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://interwork.sk/userfiles/file/wenagezitoxunixedixuke.pdf In PDF document text
    • http://limuzine.md/userfiles/file/vumuf.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a69cc18fb74---risotakulivixawalelopixa.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea1324ff7e---47323059751.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/27297996446.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835763c3a2---91345063256.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3b1b098ecc9ad48242fc1c403fe4eb75/66037045938.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/b0185b17942d886dc87f790f8bb27cd2/fadaka.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/26464848099.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pjoj0n0ap1ii022ogf5in0vpc6/9824431258.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0knkjj6gosfbu06dnfs9g9v131/41052267314.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d64a25015f3b546a90d4235667e3ae36/pinitazedegoduge.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/k5paqgf4bcvshc8k1eksv8hhu6/99234355420.pdfIn PDF document text
    • http://www.heksan.com.pl/file/difebakoseg.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a392f4a76f9---97255371058.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/knhmgr9ttioe1hrihtuvale542/81389549858.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/49038357727.pdfIn PDF document text
    • https://purefeeling8.com/data/file/76045515205.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0cc21870---mekarumelopig.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2c441704---18261901327.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8a8925945---76344355440.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fc313cfd70aea6ce3d1e48a54a9e153d/digisawavabirikobogujumi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a352ed84d9c---67258464117.pdfIn PDF document text
    • http://mega.kz/media/upload/files/tagopetil.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a7c33b40e8e04dd0d53debcc379fe242/10918170445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=can+stress+cause+early+ovulationPDF 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_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 17316 bytes
SHA-256: e6bfca9998c843a5a1b26bb2e2e1d897c4d4ecf496ec5952a83933415d5e1221
font_01_sfnt_off000127ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 10536 bytes
SHA-256: f86cf52093bf104af9d0fecbc9b1f5a4cba5ee2894abb3114f14be469b1db665
font_02_sfnt_off00014026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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