Malicious PDF — malware analysis report

Static analysis result for SHA-256 b698638b3b2c5f83…

MALICIOUS

PDF

104.6 KB Created: 2021-06-29 04:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 40148a476f8c155c0ef6a246b09867b6 SHA-1: 6a29a40fd40eafb2a5e426e326fbc13d2436f7e4 SHA-256: b698638b3b2c5f83395e0c9753b510257279dbf489c29af44f2264eea9f80e12
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure suggests a non-standard document designed to redirect users. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c646a3c6c8bc500c39696b33649dd94c/kimojabawixoxofuki.pdf In PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbf3ca83c---95138460937.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3294a1734---44110029349.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/092v25kfghqc1g36om8udph3a1/69198971325.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gvmbrq9dfjebdvefckermk9hl6/42480204555.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/d36auv0rresg1f0sf0tju27c5q/wejerefobatedujalajibuzaz.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/24266339429.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2c94f9d4---62524616934.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae024789886---luturerinabo.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6d0a57edc2c858adf6d79993a039f60c/noravedax.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0qfhivmrt7fjmrmqc8k4ilo5no/67260661366.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/89842563382.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/37d5e494409610eb942fec5c334c24a1/vijebofav.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nojixoxodulotipew.pdfIn PDF document text
    • http://samtekelektrik.com/files/josisedotegalerofawexeji.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/59385cf50a40307126b1d87352286b1a/60577841652.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8d89c127---86887418473.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5459b40aa61b5ba08661ff18c3d95214/gidotijilisajade.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/venowarufaxazid.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/rabaselojifa.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/vk1oepfuhb88j9pk8ffvk0iii6/36763399001.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec55502752---47513641828.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/14247515190.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0129c4ea6c---vuzexebipavof.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/02a7f91a72dec718d7e4964c7246230f/zaponuminodugipirajapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=where+can+i+watch+my+hero+academia+heroes+rising+moviePDF 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://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_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 18920 bytes
SHA-256: 138a2abf3f7643f4a14fb41457d44283c57af9008c048b7eb5440895e7ad88d8
font_01_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 11028 bytes
SHA-256: 25ce3313bbef5cd1067f26b4b7c4a434a5a5428a5a82705136ddc15254cc7534
font_02_sfnt_off0001479c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAD 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_04_sfnt_off000176b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B9 7624 bytes
SHA-256: 31400208cdc69be8f03e3431d757c412a0266d23eceb7464a5020a4cdabd41e5

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