Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7440cf90096db65…

MALICIOUS

PDF

101.9 KB Created: 2021-09-05 11:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e38657ad1b79fcaa1c992d97cf08d82 SHA-1: 7f143b045a0c0170c6595a60ec0b1ec5731def6b SHA-256: e7440cf90096db65b48eb3637ed5e73a0e5e1765494d53bbddf855a685091965
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=roller+coasters+and+energy+physics+classroom+worksheet+answers PDF link annotation
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160858aa3a526d---50356241854.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/195d54n3ftu4msb5d6j70ock46/lojolinulidix.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6d60daefc016a800e6281d9f74fa36e7/dujutomi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/it93mkani1gikibdto0s0u3sv3/25255610146.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783c81e9bd9---95816977853.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c061d190c85e704b85711b8fcd85479/xigozowuxudumepa.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/riduj.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/fixafoleguzosuzis.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/85915365133.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/80347810139.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/99992376546.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/da92b5613f6f81b8ee2ae49c989e31f8/terusemiwuterilexi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c104c311237---rabafesoviwavitiboxi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9a6e02ed99da46d79a3544eae63f7a69/gematizuluda.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3077be59---84007882747.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/48ab32b4ade42636d7f0d7a386cd699e/59445797812.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/8216749981.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/65945505009.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ae941ec490a---99071333912.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/55408958786.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/vckphn82k5o4f0cv1442d9qo03/61112938104.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/vixerudulumesefenepulego.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_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 21732 bytes
SHA-256: ce5112b594e773998d45902a855a830422bcd909a776e3682b0c8fe2f0a1486c
font_01_sfnt_off0001576d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576D 11296 bytes
SHA-256: b36b95d8e187a3494fa7693a80e1488253015cc2f181f03500ad5fb7b6829dff
font_02_sfnt_off000171a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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