Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18a89b806bc3ff7…

MALICIOUS

PDF

84.2 KB Created: 2021-07-24 23:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dce4bf6e0994af1d23f665db10285a9a SHA-1: 22c23be609c3aa5eaa36308909ce530806bcf79e SHA-256: c18a89b806bc3ff7e97ed268ab4f5d998d6f2f17f81c7ab1ca939c2acec26f6a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The file's purpose appears to be directing users to potentially malicious content hosted on various websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://preciz.com/uploads/wysiwyg/files/xinuwalopuxerutoxola.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/l8cqlug72nsdmujgpgimkgsct3/41413318467.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/didagojigan.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/lanimajidafakidevurejem.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/dakelowofadanidurexe.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c75e2b2be---79165246650.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/pse8juh0hntgovutdpcabgumr0/nimafavunuminazu.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/ruwuso.pdfIn PDF document text
    • https://soechi.id/userfiles/file/sodedu.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/76659223428.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8aa27169461b9ca0046e8d06faed841b/63697423912.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210708034414.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/fivedafodubiweboletuz.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rb2bsu4c9m8j4beb4bgp3ufl24/27132340715.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833c27e6f2---bonilenevitubu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3a8924073---pobadajusopobo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/69188341511.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/33035567797.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a99rmi2mo6tkg7l3umh8pgjd32/zinokegelo.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kisikozezorone.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/h0rmeko0iqirn1eah8tof5ie8g/17285748177.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/sozar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unfair+mario+unblocked+stuffPDF 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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 16692 bytes
SHA-256: 7a4b196149495d1042ba74451b79fd0db3c4993b71d7feacbbfd586b12e29149
font_01_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 10976 bytes
SHA-256: b424349502d27e318710ca016066a8d2e43689d91cc3a16bc0d4f84e9ac25cfe
font_02_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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