Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1ff9ddfc5191f7…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 16:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b16b807a69065ac3673134631587edab SHA-1: e308555e752f1007d1cf57cdf15e11ee133684a4 SHA-256: 8c1ff9ddfc5191f7249a509add53802c4abe426f4c0931cc787c8768838a6b47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an intent to redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=how+to+know+connected+wifi+password+on+android PDF link annotation
    • http://sswjeans.com/files/98980435384.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/88014991689.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///sekevusowiginerezolasi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2a16a67f---70926955542.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/xaloki.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gegozowitaziboxubosi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf51b9da24---fasagugawete.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/botivefapi.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/kuvaxenazo.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/52792672958.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/tfsodeorn4a53hvotagm298594/75866335022.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/87915454380.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109150702145955.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/gesasofi.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109131526231802.pdfIn PDF document text
    • http://ge-mak.com/files/57551048845.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/kezuwemexigigivivegal.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150faccbf747---lidufema.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/wepinudagefopuki.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/jijidasegubuxujovoxo.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/petilumoniwelunekato.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bh3pn4r2g55kl5f2mkdqm74iab/tunikuzanisefubofotegi.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/repimigikokuvizikutedag.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/23612953851.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/vefulikogazuvato.pdfIn PDF document text
    • 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_off0000b154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB154 14292 bytes
SHA-256: 2f3159edc9ff37869b5282ba36b571688b56ae4e626785e5561ac0b1f57d33d8
font_01_sfnt_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 10736 bytes
SHA-256: 13b07c4b7fcfc459fa7b460c4f79d670ee0e0a2bc157e18d58fb64051f3dba62
font_02_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1