Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ac746cbd1c8322…

MALICIOUS

PDF

85.9 KB Created: 2021-07-02 01:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01e9fd060a3be4a6645422ffd15f55dc SHA-1: b35ea8d31fa2c660ccc252673a3cb381be5fb3b1 SHA-256: 57ac746cbd1c83222637683a26cca195f89db89d5e567aa9a9bf7718dd49315b
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/15ef0ff5632940129d1398482a89562b/70359098460.pdf In PDF document text
    • http://ladyqueen.it/userfiles/files/retogojoxofotukaguxopuse.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/63704628817.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/80440412258.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851d2379fc---jemakovibag.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lusuvonuzadutopomak.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ec4db803---gowumobivonizit.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985b0088adb---gurekivatikaxurawan.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/92340510694.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/95082742645.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/16551580559.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/kiworaw.pdfIn PDF document text
    • http://www.siposferenc.hu/html/21608907632.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68e0c029bd---33012525972.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ipa7e8e95i4qnrova602fv5s2p/xavasebiv.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d232a67ee45---5597937272.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d17646d238d36102729342b8520c3480/vezosakusared.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/19200888793.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ea6b19c2b75f23fb75c42f1d8b66d99b/97867520960.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/gokitemana.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/momodufikipuliduf.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/wipenib.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d763e4aa31---zenitoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nitrous+oxide+use+in+dentistryPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/4518e88754d82dd278ad21b3ed6a8ed0/46069818583.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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 17040 bytes
SHA-256: f7f88f96418879d9872d7ce646799cffdc3a1fc9fd0592fd40f48dd3eadf5480
font_01_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 10328 bytes
SHA-256: 9b9a5f3101f3dda796959c7b3316a67f9df2425b473b5e28da198f2293c451b4
font_02_sfnt_off00013251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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