Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0fd3e7f2307156…

MALICIOUS

PDF

81.3 KB Created: 2021-07-08 04:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2d2214be50891960ebbd3d04f3fc8176 SHA-1: ab2b19eb908f63a250a89dad50d5ae0e3832406f SHA-256: 6b0fd3e7f2307156e94f3cc06593bc8452c3f4b20fa767ae2f62fc709971721e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains a large number of embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS uploads or disposable domains. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest a link farm designed to manipulate search engine results or redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://tks-forever.com/upload/2021/07/08/file/nimuvanak.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608891824aec9---35282050869.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ddb40bb3---rejimamoke.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/tatir.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/84479123290.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210703162534598470.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/hnergo8oocgkditi0v8eeph33k/kibekalabunavetomax.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/41976276708.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3bde9df512fa9861dd922db8d4b95a5f/37221377314.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/41dnk8ce1jb53dfgr07gkjcir0/13996503117.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/39202419006.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac0c43985---27127930635.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d1e767b6a000b9712109b7114253c4ae/44270737482.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4109a9e572---fixulenugobuwuwot.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/bubaxoxapinemom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09b8639fdf---resaligafoj.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/gowegebepofexeno.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a043729b88---datexarepifagawaxeka.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f09b04704---66059523500.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/muzokisasogego.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf780bf022---newovazetulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=which+oxide+is+most+basicPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 10620 bytes
SHA-256: c539e54758e10b539f35dca958ac46552b328b64fbf1ab98af430251c3b12d21
font_01_sfnt_off0000f0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 18012 bytes
SHA-256: fe795fb81e2b497d5bcb9a24fa0270b7316e3f8a73a7a6410464f73a49dbd759

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