Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ea98f92760fc57…

MALICIOUS

PDF

79.2 KB Created: 2021-06-29 05:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79db2f666bbbfd653433944c77d03de7 SHA-1: 3387440ede407b3e406f85dcef57e94dc893481e SHA-256: b5ea98f92760fc57ae0954929b5acd2382f41d25970ce901be3ec8fc6db8272a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of external URIs and the overall structure strongly indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://medvor.ru/uplcv?utm_term=bypass+frp+android+6+apk
    • http://sireny.net/share/files/nasugozenipefud.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/48834a6405286d36c71bb8475caca27e/21839793142.pdf
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/97147717496.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160822f849da5f---posedolazozovu.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d39d9cab9---naxufadijenuriwapaligu.pdf
    • https://bandotrading.com/uploads/file/20408140157.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1f9a3d5c3464dae5d0dfeb83204f8db7/warip.pdf
    • https://agentcctv.com/userfiles/file/winiveripugadur.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814fdcb5781---7108118512.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852422adae9---63570540153.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/fdade03caab111832797bb5ba23a1905/10440696606.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a74245a54e3---40190879700.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91cf949bc4---fidokuxixiga.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/fisokudomosujugulav.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5c6cdc26db1fd4165a424d7f67973a8b/52723684386.pdf
    • https://flardochform.se/userfiles/file/goperud.pdf
    • https://b2cexpressdemo.com/userfiles/file/77803876009.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821e9e6d2e0---13217001418.pdf
    • http://www.aluvascientific.com/UserFiles/file/zebabimo.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/masaj.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/11330380571.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f783b046c66b6652c3260ceb9cae1712/loviribari.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a109a177c1c---giwafimojonovefa.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/36901630149.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5bcd3ad6c96ac36ebd2291aa6cc6b4f2/sefiwarelam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b1.bin
b9b76add0a90f037e905b4ac9d85d79af0db0ff144a6f8e705539ee45abedf52
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 18048 bytes
font_01_sfnt_off0000ff3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 16792 bytes
font_02_sfnt_off00011756.bin
cd1b6639987fd9411d8da86b28083f2344de90fe4040aba5399f17396fa31f7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 10640 bytes