Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb0789b1fa43217…

MALICIOUS

PDF

107.4 KB Created: 2021-07-20 17:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 041d86ea1377cddd93d80b19eaba6478 SHA-1: 77bc3d5fc447c687c1d5d13da795e49e369e347e SHA-256: 5fb0789b1fa432170723a21fd6028d48ebaafb74033f409ae70f877d5a2b509d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. ClamAV and ML classifiers identified this as a phishing trojan. The embedded URLs and the heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9dknbuj7h283aqrvju7hr70pth/75974381731.pdf
    • http://ahcxdq.com/uploads/file/17193026857.pdf
    • https://vatlieutaphu.com/upload/files/waxubev.pdf
    • https://hantverksakuten.se/ckfinder/userfiles/files/xaroxilusolodulowekuvi.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4a41cuscekgitfkp884ucepsa6/wejokopirarenefobetomadut.pdf
    • http://hkacca.com/userfiles/30298849491.pdf
    • https://muzeumkonstancina.pl/attachments/file/gukavuzu.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/59b3010ea9b0bef014e5ad936eb4842d/bowemiterakonogexez.pdf
    • https://domilot.com/uploader/files/bovaf.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/gowazediledimit.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/90eb6a41a5eeb724eae297ac543af66a/74245430631.pdf
    • https://sabagdasarov.ru/upload/file/93093565637.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f8c13506a035c8c3270d2ec00a16f40/gedolebunubujumik.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491f50f264---82837185642.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/aqn40k09o7966t12jh5dfe7kl8/9334098122.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/031rcma6er47asgkg52gr9piu9/sagem.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e96ac895---pugepeko.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f81dd3c366431f6ccedf91ea0ec4fc37/jezibotiketale.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totuzizixazuwakodu.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/637a36fce9b1abf59893944b66efcfab/6384771468.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e1b0357c---31393436461.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/famux.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6e5a13b1a50c22f77ca4277b942ff6aa/zevizebeluzix.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/4033f23d30e3bf9090f322e75023546d/kolodalumuvutimot.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7528fde34d6bdbde8691ea02cf44f918/valoxidovubep.pdf
    • http://amon-syotengai.com/userfiles/file/24964337823.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+author%27s+purpose+in+common+sense
    • 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_off00014244.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14244 16792 bytes
font_01_sfnt_off00015a56.bin
3f9591fedf6b1c408c5d878c1472e521e4612b3160814713a91728bac969d7a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A56 17304 bytes
font_02_sfnt_off00018775.bin
0e5b57a06654d2ca594da8310ceddc0d73fd3591938fb93c67fe54f32392093c
pdf-font-stream PDF embedded font (sfnt) at offset 0x18775 10720 bytes