Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fa83229944fbf6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 15:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0b2e93082b68010acf60a10cad57121 SHA-1: 603037f6f63a02d10580ada8ad7d945541ee29d2 SHA-256: 91fa83229944fbf64403c0b8d90a1d995794299621c7a090032a32c380bc7a85
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to other resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/89539521843.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138b9ae49d3b---zirevomepa.pdfIn PDF document text
    • https://baptistfriends.org/media/vifagexijemeximarovetad.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/88407461167.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b40036bf---wususesabisujiziz.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/ziterosogugezorojejumupe.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/99482002738.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/tasitugolujirufazubosoje.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba3d44688---55345015523.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/8754295277.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/67804703566.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nigimvt7ad8m8e5ci1g77ibc3v/vivojasifafeporofiwuxo.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/kegokat.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/56106877711.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/26796977018.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/malobamajowetifubiwix.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/bejorutegomofibeguleto.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/21740173385.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/57555572482.pdfIn PDF document text
    • http://dr-temt.ru/images/file/61073996449.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/vemagosituvem.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/toxukazizaros.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/97004277989.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/14285293808.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/dirijobigimapafemalosura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=toca+city+apk+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 23276 bytes
SHA-256: e02be56bb836208c0713dbf5014af6607e94ad39e166a0dbed5d9ba4b079e0a2
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 16256 bytes
SHA-256: 344cc5b7d46c1b8feaa17c151bddb49b82ab681670ada826ce3d59e0f478ddb4
font_02_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 10324 bytes
SHA-256: 994794794ac3d46071d383f6f80101990e5e3638c42c36c4a75ba7ceb349c514
font_03_sfnt_off0001373a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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