Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fded306c994ff1…

MALICIOUS

PDF

115.5 KB Created: 2021-07-23 05:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 87948787f75ceb0ae9b35b8e63aff2c1 SHA-1: 9df553dfa766876eb2f0c7af48c66e12dc652ac4 SHA-256: 71fded306c994ff151c20b1a1fad76af1537d8ae0c91d4393ac5e10dabd3d53a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and contains no readable text, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/n1q1jp5041t439v0u5krmguak1/62303532502.pdf In PDF document text
    • http://idealhca.com/admin/images/file/4801329933.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606e556e5a4d5---wudebolofawixabinukug.pdfIn PDF document text
    • https://argumentua.com/i/file/1901865836.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/1b5s3ifq9e8j5l3favt9dnhvrf/11200492574.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/70975071693.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xotut.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/30126400848.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210626130544_1j4e4x.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/99344968248.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0a3a8e7a13cf0a2d33a499cc60b70d63/sulatebadaken.pdfIn PDF document text
    • http://come2menorca.com/images/file/50687297339.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/kojasunuwe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/3395151125.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/11632694326.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af3bc3f7b---javagerosogeberatomedu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a11eb22adc8b9da7ca6dbb03cb8738d2/rikuzakesoninum.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gb95piaf2kri7jakqgo87qpui2/joberebonoguwumesafem.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/41456621070.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/eba0d2ca65f7bf059e887ba6745e1e9e/ranujinipozogalefubo.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/nareganuturofazesijane.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/30097449260.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zikakadujilosurojujip.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/deviwepegawolosob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=every+character+in+danganronpa+2PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 3040 bytes
SHA-256: 457ef634fb04f24db46a1decb978c59bb7246bbf0982d915bc7d3ae01f28b261
font_01_sfnt_off00014482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 18656 bytes
SHA-256: d8ad5b796d327f6a14244c40f2b52da08e5d560230d2cbf6e87f961c436a591d
font_02_sfnt_off00017567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D78 16272 bytes
SHA-256: 2517cfb74ddab6c085ad66f747e1c234ae14ea6e68469ff57d387aa8e59960b0
font_04_sfnt_off0001a39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A39C 10864 bytes
SHA-256: f5c9f5e075b2c1b07bd4fcbec66511d52c164000cc473e5b32597fc95193aaee

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