Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a9aadbcbc59aaa…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 17:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40f0d5ee53b1d08ae0f4b0c0d91b615a SHA-1: d11776feefb75e7dd38486d3cb3d6f0c660a5cf6 SHA-256: e4a9aadbcbc59aaac6fcba2e1b084d91f3584beb2934022d8e0a55e23fe85563
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 an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with several URLs pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://euforbiabulgaria.gbinvest.net/uploads/pages/files/16102749936.pdf In PDF document text
    • http://shengnabei.com/uploadfile/file///2021090118083088.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161311750b67f7---45389363185.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/nibokidekigerix.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/xawiwuvukado.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/57887330915.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/bixoxijosuketisupexaw.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/tibakenisemefijuwemag.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/vubevujatokafoz.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/9505111874.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16136429508d78---xovalozo.pdfIn PDF document text
    • http://santehnika34.ru/images/file/4459482395.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/86828357521.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/24618484372.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/12542320822.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ad8e2180b6e0b6c8f7cbec2cb88de059/pitowu.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/sanabotunagegijawenimag.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/7811528415.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/742ea1be727a619008497e8d4cff5dbb/57913228496.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/dusejovi.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/36336516243.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/ximoluge.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/58558033693.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/21214801535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=statistics+for+business+and+economics+8th+edition+solutions+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 17996 bytes
SHA-256: df262972ae4e0c34828f16b94dc0289f4c51d39c6e21b90816836fadb215038b
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 11408 bytes
SHA-256: 2ce4933b42d8398fdeb5d83e553f5188951e1d4815b2a6ba64f9af513a4530e7
font_02_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1