Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d3ec03e83595bb…

MALICIOUS

PDF

93.4 KB Created: 2021-07-06 22:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dcfcd0c1abdc2d0aa6727da5de561269 SHA-1: 6eacab97e7be31f55a5fc8c2d293b1f9907b8b4c SHA-256: 31d3ec03e83595bb3f410c915b5c0a081415086e9eba5fdfdb566cb850156371
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links on disposable hosting and compromised CMS uploads suggests an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7756e39569---kolanineriledazerazikule.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/2jtds4o26plm60lqt2v7d63si3/67020083462.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/97779334449.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ef585dda---kapoku.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/bakarosepigunefurofufoki.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lotokanipo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3215c71a46d8e9d54e06af1ef460cb21/53286603968.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/dda460d0d68c980f329cef266fbe74ff/xafejajelupatibiloji.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/lijasatakosiv.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c938a06a290---70294766929.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116c030b2d---64900393747.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/mipozevoritideguvagexu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7cc2f10f3---dilenonozenewesi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e7d0fc5f096779e2cde4102a244a2e9/61546784792.pdfIn PDF document text
    • https://reniuved.it/file/43105377511.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098787100272---luxamowatopenutejuka.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8cbdb5f94---77878657361.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8183857456---87395444856.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160909209ba76d---34424910393.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71aa6437b---33067709122.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fl7t1mpkvlj1vtm6duasnbn2b1/zugepesux.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c8ed7241f3e9e77981d3c90d9a7aa2af/88928280564.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e257a97c3---guriwedomabolapubudulik.pdfIn PDF document text
    • http://santeh.md/img/files/wapaseboli.pdfIn PDF document text
    • http://zzquansu.cn/d/files/wazulitisabisazid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+write+a+reading+journalPDF 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
stream_004_off00014e8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14E8E 10564 bytes
SHA-256: 7bf012d1933ae3064399d8f2f79ffdb1cdf8499bf284355e9ea341cef99cee4f
font_00_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 17824 bytes
SHA-256: e93ccb3c45d861a404250139d1f830757e597e7d6f0d31a825becb9dcf3cae24

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