Malicious PDF — malware analysis report

Static analysis result for SHA-256 559fea6c8ef7a9d8…

MALICIOUS

PDF

90.7 KB Created: 2021-06-27 01:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df9d37dd93b0b1917b331d18d43d1241 SHA-1: 31e7b1abc62dfa6f11b35deb1f3c06e33d31ebd1 SHA-256: 559fea6c8ef7a9d8e31a4845571968d98a1a83f6c467396fc94498066894f39f
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. It contains numerous embedded URLs pointing to compromised websites, specifically leveraging WordPress plugin vulnerabilities for file uploads. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dcd0c5ebd---81373713068.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a937991f6ec---38645515987.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/08cd2cc16695c4a809fba45d2f49ff0f/16167268954.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ba75106b---nanunofamodu.pdf
    • http://bidmitt.com/img/files/file/kadaxolutejetodaxen.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/bd4d99dd7ea028ffbbfbe1a19822cd5e/wadogonini.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b35c4c90157---zaxezajo.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/panifemuluvobevufesewifov.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7re0sghi92jh3rlr7kc4hq6gt/7131202489.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f0e1eb24---tekinegojup.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a173b96fde4---dimegejipibijididuzumida.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9mfeubfqbas3ssunn7alupqve7/44284456689.pdf
    • http://jcpingie.be/public/files/jilitegosuvadubikuviw.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54c66cacc---borofebupabimijefonex.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d0e48fc1a85c587fdcbf0fcfcaafa588/bujesisas.pdf
    • http://wojno-stal.pl/pliki/file/7552889333.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b3945ca13ed7666c7dba55b247804c28/zebimexezitezekaweb.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/df87577d400c3e3dfa099528bc0521f0/sakavudu.pdf
    • http://ibb-online.ru/f/file/fugewejezamidofogezux.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/fd0e329b0064fc3b431ffe8995c1d30a/75471980313.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3742607cb72f938089aafffb99a728d1/61806535831.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607313a3324d6---naxodopapavaza.pdf
    • https://aimhc.com/userfiles/file/vopefuridudazuxijukaxezij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=vector+questions+and+answers+class+11+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_off0000f95c.bin
cdea61fa395a5f70cf99e38282a2952a7f6871ee38c025b99ed765b54d32875f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 18328 bytes
font_01_sfnt_off00012a65.bin
4100c9cf651c49f6a5576ac35cf1ca7f663ba1cd7c600f6d278e7eca5aa4910d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 10968 bytes
font_02_sfnt_off000143db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143DB 16792 bytes