Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bb28262ffd8eac…

MALICIOUS

PDF

91.2 KB Created: 2021-08-14 07:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74d2d8e78395f2f0d003223b08f89bbb SHA-1: 0ea8a855fc5c59cdd11b77e4cf5c1310d385b457 SHA-256: 77bb28262ffd8eac743d12723b25f8434764a2ccdc12dff1e708679f8cd4386e
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The presence of a visual download button further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0087431bf8385b4a9c1d89d44a91aac8/xupotukosipinefabu.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/uxujirovovimepaja.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00f7b7e64f---pixovilo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o0pefqeou3iirsvnpbnllc7jr3/22863933047.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/65lmrd98pki7hktodgq0d0rb45/zebiluvodupug.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708cc5a7e98---69292854721.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1253159479c66f1a10f6818a92d73b96/66084851246.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2420be0cbc02bea070099a58b9673eef/26854735146.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/44261479907.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/63220206970.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/josuvoxefanomopolusum.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e3566a1b---sozadaramituronixevigi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e51767979---74170955198.pdfIn PDF document text
    • https://www.shinoda-usa.com/ckfinder/userfiles/files/5661597032.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160702a3b825bb---76439181964.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/78954423727.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c147a2be33---vawepagufoberagutew.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/81394457545.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/dutasegshjr3h04qn9v76deqe5/rufisogixirivupaf.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/55374123553.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021072415540135.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4499398a4c---mawasefokezuk.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/392e4h76hva4mava5m3qae7lm0/nawuxizelusavekadub.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/puluxajepividoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=never+back+down+3+full+movie+download+in+hindi+worldfree4uPDF 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_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 16816 bytes
SHA-256: d912ca2ee9deaf99a1a5351b25287178c70960ea71a5dce36eeed0456f6c7351
font_01_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001446e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446E 11188 bytes
SHA-256: 44323709b95a373df1b147d3b8076fc15694de574025405f2e9e108e89040835