Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f8d9b52ae43896…

MALICIOUS

PDF

94.9 KB Created: 2021-09-04 07:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d33c80d2434aa9da072415b7a7871244 SHA-1: 1a4839a6dda7d1bf92000fb59a9533eefadae9cb SHA-256: 39f8d9b52ae43896aad5697dcf14e2ebd25be34a8b3f4073ec2e3e517bfd3141
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16074aefbbbc5b---35414800814.pdf In PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/30f558b10a29f64d7bd5434907c81825/36611313153.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/37663476534.pdfIn PDF document text
    • http://candientuvibra.com/images/file/33891561375.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bee64f3f---raduwedejotule.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a147620e---lesogelujogibelopagakut.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0a3d666820e1bf3d36d8bcf116f2cb1e/tetutawef.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085b37d90cf8---nimurazu.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/4903858608.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/sutusevibejevizo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f656d645e2b962b947528e4bdbfa05e8/33575895774.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8b303035e---lolisamelibulimajaxa.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc99ea0720---33269151988.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094552468a0f---tebafakegomaj.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/vafat.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4dcee18d160f5bc0a579f765c2b86aa2/74431953992.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e4a450a27---soparisojebe.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/99964536769.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160889e97413fa---22004352925.pdfIn PDF document text
    • https://chineseclothingonline.com/File/kogetufujuki.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/126d905b896c189ac4e72bd09d64fd41/gujorowuzusar.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/73e5d3cebd751191989d72eddfdecf18/90101699136.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836bc7da49f---20428910452.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nowinirofenerukajanegemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=vinayagar+ashtothram+in+english+pdfPDF 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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 25264 bytes
SHA-256: 883474c8f52397bed4059b5a10fa196c1ffbb713761c4c90fd8358cfb7e9c1d2
font_01_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13417 16620 bytes
SHA-256: 3c40b55faeb727c27fca3b5dd3571a7b9306fa3d2e6ed1e1a466b4d61008eb89
font_03_sfnt_off00014b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7D 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off0001537a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537A 11028 bytes
SHA-256: 223f94cb781ed3f9fd79fec8a1282cb873ebf58fc3ecc537a342763e3873c8dd

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