Malicious PDF — malware analysis report

Static analysis result for SHA-256 5550d9b6845d26f7…

MALICIOUS

PDF

107.3 KB Created: 2021-07-13 22:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6182671167ea16ff9a356bda7c3f7c59 SHA-1: 72ec44b751b697c2f5dbc812179204449b7b443f SHA-256: 5550d9b6845d26f742a3136c501f9bcda41039ba668ab40d6a320c8a8e1de09c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://lammensfilip.be/uploads/files/14065802371.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0t4i87fhh8joqq9ld20njfcv6m/23429739902.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e7bc575e---96751654721.pdf
    • https://soechi.net/userfiles/file/38442858365.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf11baec5---mevikemezu.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f3e6302b---65093491889.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f2b108b0---wapiwukasavolago.pdf
    • http://parkhigh65.com/clients/4970/File/46925027422.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/m281bal5botn229700nkfb6u26/mibuzuvipatizoronugi.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853c1926dc8---78584478034.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0d93543c---61428490417.pdf
    • http://lbtech.kr/upfile/files/9531451446.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d48041aa---33980874292.pdf
    • http://ashioke.com/images/library/File/90201595279.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ju6mh535tfj4t9277uo7tpro4o/bedabomabizolilefixu.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/20deae88cfdba31c781fc57bbbfae8c8/jumataxogezukopevok.pdf
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/zupulazojikekelunup.pdf
    • https://chp-travel.ir/data/file/senazul.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6c99c1a0---48993503134.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d161917b31---kekanuvuro.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/lasenufatodisanovanap.pdf
    • https://maydangson.com/vietkiendo/upload/file/80701483095.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b898aa08b9d782215fe69c7a1831e7b3/23344891369.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c84f67b025f3e673a912fbf9cea30590/34781276208.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fall+in+love+caption
    • 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_off000145db.bin
cb1f48ecdfbcacd27c6643a1431510600f69d9102444c23a3a65c3071ccf8076
pdf-font-stream PDF embedded font (sfnt) at offset 0x145DB 17092 bytes
font_01_sfnt_off0001716f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1716F 16792 bytes
font_02_sfnt_off00018986.bin
8daf98e624eb614604e600646d6f3f2d299b22e99ae3731025396f4b3d017fe8
pdf-font-stream PDF embedded font (sfnt) at offset 0x18986 10140 bytes