Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ce1fc360688d39…

MALICIOUS

PDF

91.9 KB Created: 2021-06-26 01:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3acb42b97a45139bb5c11ea886388920 SHA-1: 27990e65fffc622d9543ee30273a2b50f29275ff SHA-256: d8ce1fc360688d39d615657d5d980207c646c3b83ba23052712122dc9f58d1fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further reinforcing a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://crewmak.ru/uplcv?utm_term=unceremoniously+meaning+in+english PDF link annotation
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/77c8b8e21b0ce0af9e7c3fb359d058f4/70794113310.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/132a2a6993583e908d41c405ddddb38b/31252148040.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/efilrp70j9fn2ut2bgf0f1lugq/87349214862.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160751e5194ab4---zesupiv.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ce1a9dc8f337fe925cf0068a2c38e725/5973499395.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c2694a654b0d9b36687d2001edb73a79/vopasafesumuf.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/65863971445.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/31387255632.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b1df4354a017ac7c42fc52f40578fc22/pafar.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/30119782495.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p5b6nc7jtome6r4fef0p8b29n0/zawomotode.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/5822616016.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/25nasakkmdvea34kn9l9u18ak7/wozamedodijodafekijuwej.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/javuvuv.pdfIn PDF document text
    • http://arslanemlak.come/file/43370579842.pdfIn PDF document text
    • https://designclarf.it/file/50935287757.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/3014944397.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a563909b7c8---65997219326.pdfIn PDF document text
    • https://loctra.net/userfiles/file/24151057338.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/22160111596.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/nimabef.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3232132e717e41a09059ac2cbd18cf83/sogigedevobunoj.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014227.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14227 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 23464 bytes
SHA-256: 48bafe981e9008c817079ebe1ae69c185e8a812f131d52d7fc788bbdc1fcc46b
font_01_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 10800 bytes
SHA-256: 4d2cb1df7e8a23fe66c67f68613724236c8799817ccecc9d64c9ebc7b1956ebc
font_02_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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