Malicious PDF — malware analysis report

Static analysis result for SHA-256 8577bcd42d36167c…

MALICIOUS

PDF

85.9 KB Created: 2021-06-20 05:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e008fad6531c50c42f849f2424bc9dc7 SHA-1: d41d167204fd502fd242d2c10bd401aaace03a21 SHA-256: 8577bcd42d36167c235e309359cc31009a3e73481720b802359d3c40572f815d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish for information. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, many hosted on compromised CMS uploads, supports this assessment. No scripts were extracted, but the overall structure and heuristic firings indicate a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/nf8tk2og3v6e2irh7e6suf2ms2/mobobojonebofujilu.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/97b7c6cc44692c29b1c861873c8da3ed/58417609295.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c69980a9df7---17738350565.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ca3dd05bb72171f68e10359d6d9ee78d/mobobezowulejo.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/98390602429.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/tixexu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/de66e7b841af84cbb4d799df8a3f2c88/65513434724.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/39432609770.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/69408730c10eaec088cade794c4d385f/pelikunirif.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/caacf2f1a59348ef2f1cf9355b52381b/34517530886.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210604235236.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9baa22d8---49343241296.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088339773265---mowedimapijifuwebipaludod.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/wofasik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+lagu+unstoppable+mp3PDF link annotation
    • 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://scripts.sil.org/OFLIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F3 5412 bytes
SHA-256: 1c4a33497a47ed8268fcfef424640e0982621f8350ad5de685510d9197e94673
font_01_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 6532 bytes
SHA-256: 5952fe79acfda61047ddafa8c2faf71aadded6635e48695d2230b341c1e41fef
font_02_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 13096 bytes
SHA-256: 37028227d8877de5f54d4ccf6469084ec0716ff6c9ac4f41af5094b3a148d454
font_03_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16448 bytes
SHA-256: 7d205fe9f383aefee03729289088196905633eab4d3cc90dbe752f60a3584f65
font_04_sfnt_off00013bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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