Malicious PDF — malware analysis report

Static analysis result for SHA-256 907883858417b479…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 02:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 294324448e89389686fcb8d09c084225 SHA-1: 7207cc719b24962d30dc1e7f8bdc9e3b188bc85f SHA-256: 907883858417b4798d4af9650bea5b9b11eae4a466783b772db221700164acaa
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to deceive users. The heuristic 'SE_INVOICE_LURE' suggests a fake invoice or payment pretext for these links. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://archism.ru/uplcv?utm_term=on+playing+the+flute+quantz+pdf PDF link annotation
    • https://t2sc.me/userfiles/tepajusegatenakusijogow.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/86405563014.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/51473521380.pdfIn PDF document text
    • https://clove7.com/userfiles/file/xuwiwikipo.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/10627983738.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cd0b188edcc4ae0bc72a624d87c8748a/86368369920.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/32475370365.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/sixipilejujumelolajow.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d62e0c41527---42263663555.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/foxedisoteki.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/zukike.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/buwivafobevumowajul.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb8481f01---94131383540.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfac22edc03---vodikumawo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a705c9e286c---57694542761.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/351183ef65febd13dc35f8e8eaf12bfc/61948506787.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20504a11c8---21001556699.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/85290391bd7fc08faa107c3e15ecb47e/lejewapat.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/84629729227.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/59321219598.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/salujuv.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/3885440000.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/af95bba921c25742ff72e7570a7172d1/22832252075.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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 10836 bytes
SHA-256: acb356dc54e5fc43da6681077d3ba5e1137df6d5f370300c461ddeeefdd93157
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 18908 bytes
SHA-256: 92a5c337616527ddada4cdb254f7399b0bad5aa9605d0e8a46bfb5498b9a72d3
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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