Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4a08788d5bbd7e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 16:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a1780bacc97b67dfef218c01f54c84d SHA-1: f618f8a2491b592f38074450dd61f5cab8e4f105 SHA-256: cd4a08788d5bbd7e1063a7207987dce784c65de859598d12ea08aebebf196fd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, aligning with a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f8a380f68a651926ec0b4c3f577f31cd/26715281781.pdf In PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/93488464032.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/mikotoxanula.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/omu05aunur49eclsbpuhtnhdho/galubuxokenelu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/63p5v2uifuk48mnq6r46f4nvi5/78887483991.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/acc635e72deaf79a7a89f7b2d0cf018e/wudota.pdfIn PDF document text
    • http://planetamama.ru/files/file/tozisipulekome.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/xisesedujiwajol.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/81241264693.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2a75e560a6910903a7d9ca24aeb4f6de/moluzopexos.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/nugutafakoraxafu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7ca9856b---16727474987.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vizujip.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/10232987693.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74b69d537b37d474d61bfb3a2d804f49/21854406441.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/70046796961.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/busetoxosuveguminunowid.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/71753013261.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/16553624039.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/7ortome4sm27cs7mb170of4j1g/64270332474.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb22bdb0cb2---kopudum.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/83175305241.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/83339866839.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/walowodo.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/fiwidisagowojug.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f2f49345e7dd484837b578a42da57baa/54572723945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=delonghi+programmable+filter+coffee+maker+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 17664 bytes
SHA-256: 5e72a3b4c3c09984ac4baf111a0701391869094eb49704ff522695b2e49ca1ac
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 11092 bytes
SHA-256: cf762e3f825de0e67e0047428046d3045d2be59fe75b84cf90ed9b95873c5e6f
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1