Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bb413ea66eade8…

MALICIOUS

PDF

88.3 KB Created: 2021-08-03 06:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ff9789d61204d9daf96240b6be1fa50 SHA-1: 22d081d5c92d837981aba6b05e1fcd908117ed11 SHA-256: e7bb413ea66eade834cfedbbebf43c9bc440acad7dbb71e89a6c0c4983feaa62
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve to distribute further malicious content or manipulate search engine results. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pistant.ru/uplcv?utm_term=cannibalism+in+the+cars+quizlet PDF link annotation
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92b3b4824e---bedagafamugaj.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/0b16eeb7516fb4080926f1426fb59c74/37278973803.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8344011e0746b3b878c5265c816fbec0/98610172575.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/03e3322ae4118a88395b508d27213ba0/fefijeduzodelalidisodi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/81g4resij2dp3hahqqhv6phi4k/60863318564.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c289706235b---74607775556.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608770abd518a---8167102525.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/fiwuwewi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48ac3bafe2---vetedalurubumevapep.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/danonesiverowari.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/golijalosebebatofunofokit.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5725be943---30431111916.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860d7acd4f---rotipinadebenex.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/34937928092.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d20a41d0---defizul.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092824430232---87840109355.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/5468708257.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950f95b4f9c---sufatasusix.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16074c525ba42b---fijivevesipisofodube.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/wujarezajijaxif.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/78423143579.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/56617040637.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/kuguko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10852 bytes
SHA-256: 20fe56829c7167aba212a1045755e37b1b77bf15b5c597671f7e11abb85b5166
font_01_sfnt_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 16248 bytes
SHA-256: 8ca2184dbd0e62674c2be024465d364f02ae2db7461a770c85d82d34f3a2a3a2
font_02_sfnt_off00013bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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