Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ac7519e5a71d8f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 05:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7b9460ebdc447d4716d7149418b8ac2 SHA-1: 1a133006596dea072bff6fa84ce83a1f330cb6e7 SHA-256: 78ac7519e5a71d8fce87713831e1344557ed4514ec0b3da808d66267491d25bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to websites that appear to be compromised CMS uploads, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is used to redirect users to potentially malicious or compromised sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/ffdd84f47ab954b7d3d34e27db9f914d/nefux.pdf In PDF document text
    • http://uamarkets.com/images/file/wilutiduf.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160de7918a51cf---logevaperevak.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e94971f157e75e622c755d6fa1bb3581/kozegorev.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/97514565999.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/22158481909.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/50495101300.pdfIn PDF document text
    • http://chinazzjx.com/d/files/debosikovabiged.pdfIn PDF document text
    • http://change4best.ru/upload/file/22153041757.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/kukutedunejoropurubef.pdfIn PDF document text
    • http://leton.pl/userfiles/file/92256006378.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9f27296d2b7c50b9b795d825b9ad0e4d/93140000635.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/34972920091.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd5bf75ef8---24725989201.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/28432928511.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9fc025a9---wanatojigejavutefodiseba.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/kamoxewanodovutulevumobak.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/25691628810.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a2dbab7c---wodukojoteluresifurese.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160887d280d767---46284674861.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/63103214050.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/sogagefemowitajaxi.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/13o5a2ce9leh6k7pjbdc8ququ2/95579305029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=importancia+de+la+diversidad+linguistica+en+mexico+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/38b5529347dc8f598df0a3462ee28810/50370601971.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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 20480 bytes
SHA-256: b29f38454c8d394c4bb8b04d7b975fcedbbe7d354c15b6afae468aa0442f5865
font_01_sfnt_off00011352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 11180 bytes
SHA-256: e2b9b3de11d28c0c9bfe4fe2fd2173d68898994ffe6be18f3f692c5436f5c73b

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