Malicious PDF — malware analysis report

Static analysis result for SHA-256 523808203133b4c5…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 15:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9662f46482ed164b084e0a1b13e67ab4 SHA-1: 1e7735fe7d39bf11490f3884c0fcda92a8fbbfb5 SHA-256: 523808203133b4c53f01cf4261ddfb7611a6173041303736876d14f313ff481a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize 'utm_term' parameters, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://irlanc.ru/uplcv?utm_term=power+quality+textbook PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608191524196c---75498154229.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sefitoduzedad.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/51782730094.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/tulinorabis.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/zexorowunaridera.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a33986017b7---47348687152.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gibemifizesizobawinozavun.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/gadekasudiribigupuj.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/numijagojeruluj.pdfIn PDF document text
    • http://midel.me/userfiles/file/2876622054.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ebe26e0cd648444080ab947f2556f3f9/kibixomanirilor.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/jivubepusobarodagusiv.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/94671389937.pdfIn PDF document text
    • http://mldinsaat.com/image/files/netugafezelefolafisa.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/56077143575.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830b2717190---44306365856.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ddf913add---42823232609.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/zokegidefafekiweviromom.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d0c48c85---29536212897.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e9004749714---dupepukijinugomapomovulug.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774c0eb50e---samipadedosuxadavopal.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210709223133.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dd8fcda028cc2821f3c8f4792f62133d/63959149741.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10608 bytes
SHA-256: 1a96909efd401dbbd8bc72187354b18488e4cc80664af562fb643c1dc21cadf0
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 17672 bytes
SHA-256: fcfff386263dc5f9f7efef7ad9b2d4aee7fed4e37c59225d5679a9bc0438fcb2
font_02_sfnt_off000133e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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