Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63515918e28fe4a…

MALICIOUS

PDF

95.9 KB Created: 2021-07-21 15:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc206377ed62bd07448dc5ee7bf8ee25 SHA-1: 4f0252b6fd3ca0be8410a665ddbe5ec79a419d9e SHA-256: f63515918e28fe4ab6262e9932689f7b2daf484c412477f9bfc05c09a6c8a1a0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1debd76767c372e5a0705d3b0a3a3c77/84667429995.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb507c9fda---69729670690.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/levogudodofujumaj.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de1b0c23846---36689650153.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9d5c70d6---5674505888.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/denalutokibewonemigur.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/16b24955969669cd93b4d783a6740304/37747559995.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de4da93af---3738110275.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/rerubodajonogotodirow.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd6837767b9ecf9ad667f005fbedfadf/86842725287.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/buzitovurogukadetamumizej.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/09agkas4shusu32j6n60j0fknc/16816068403.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/9310130449.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3314dad9---lalapewagimuwaxosuso.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/bs22p63qr5ugvln7f09cofk460/mimepefubobetizomujuwaris.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/efbb7e39ef205f1700da5a6aeb95082d/lekazibovoj.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086458846dd4---xolejalibopob.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/82135497426.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fesomujivufaxadojagi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ec924c97---sapadatulirorena.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fe0212557---86567263843.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/85673574871.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217181152259830.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8j5id66t6krft92rmb1jvn8csg/veganiwosuvad.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/hc4tmjk59469h9545m9a0hrted/57994565785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=type+and+shadow+between+old+testament+and+new+testament+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_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 10876 bytes
SHA-256: 3204c8666fa3a3ffddfb1f0859d664f6a00b4b0aa28438d782a6607006a80618
font_01_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14051 18596 bytes
SHA-256: b6ac374aecd827561225b19fb78c75209a1f68a0a7c2f7480f44e2bad5e566d2