Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c675acbe7b4c52…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 04:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b65ff19c5c8ce87005d5469d0cb64ca SHA-1: 1da02f44812b9e5407a239fb98a4872a321a31bf SHA-256: 93c675acbe7b4c527cf18e38440b3b637d19ec223a3f95f60de0c562e09caf28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary URL, https://inwebjor.ru/uplcv, suggests a redirection mechanism likely intended to lead the user to a phishing page or a malware download. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=psychology+undergraduate+dissertation+pdf PDF link annotation
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077287116df6---95358284343.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/dulebinoporudizodamudow.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d359f3fb6f---29087676498.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s36kv39pte2nckp1i7ph1e6nn6/50791502467.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/54765999920.pdfIn PDF document text
    • https://everestart.com/images/stories/file/wurokubemokalakerew.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769e1f0c570---kolujovu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/02cae3c7a145ac3ef2b8d344d1e56187/69179399593.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/zuxixowezo.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/jelofitavibebid.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/27507681716.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/76176894092.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/81284214862.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zuvapipovogi.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/wukerumiwaxibuwuj.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/kijuxasesuvomilurezufilib.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bcb57321---56891210162.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/36114177769.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16117dcd41a863---filoke.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/livovuvomimu.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cd6f156e---nelififujanopoboxej.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/7572997579.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee7d6db7c---77733421709.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 11116 bytes
SHA-256: 538353fe4c87b5ec17f599df14ffacbad3f99454f4f296d84546c3c72d7e3020
font_01_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 18076 bytes
SHA-256: 96439ce223b9a0d9f9dbdb1ad040efb6df8182c1178cdacd0552b7631d6caf21
font_02_sfnt_off00012f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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