Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83f46316693a29f…

MALICIOUS

PDF

71.7 KB Created: 2021-05-25 05:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d4a13d862d53b22e3cec0b46e3d956 SHA-1: 126024d13e90cabab90189a9dc09c829273d04a9 SHA-256: a83f46316693a29f5433c81a885e65764dd2a1a0f64eea1bd2c75678bb4812a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7771

Heuristics 5

  • 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
  • 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://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1bf52c7076c9b38cc11c22b26ea5ddb2/36165324490.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gc89g1egqkluumj4mkqthkbhc4/xiwemezewiwanagu.pdf
    • https://capecoralliving.com/media/file/jifofezagejonaxaf.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/bcb0b23e539a5922e1e926c2fe31ed12/vosuxerurupojozijub.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cc6693bac9f3854ee200d4debfbbf884/labipojojazesopigovo.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070fbc4b1b36---wadexame.pdf
    • http://taiwanglassgroup.cn/userfiles/file/57734841739.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b7ae2361f24eaa01d162937391b60e66/sugavigupigen.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160704688bc83b---9497432249.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e61039361c17ce6853fa7251ef10cac2/pulopinelas.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5v8o79i8h1cda4200b6uhgtjsl/suletigarafesivon.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb8db0853---fepisimakalisotaxodol.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/j511aor7l8vjkcjgpgsu69q542/kejewimatewikisemutepef.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb18cf0319---19391353087.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609109b44e55a---xemegenugesukawukas.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe527fc288de48c9a21a75ca984b153b/1077004401.pdf
    • http://unseenadventure.com/userfiles/file/tedekazodiporar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+summon+end+crystal+using+command+block+bedrock
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defe.bin
f61722cca5f26c9f0d321f5c65c3a79a8518bf6da35045e9f6d1c04303a4ab22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 5500 bytes
font_01_sfnt_off0000f1a6.bin
c1e9572894c6fd03e69ae4a5d0392a5a014f6927f610770041cab7c890ff580b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 10780 bytes

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