Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3a4a35ea28be5f…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 20:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c25522558222267edef67d74b7a89760 SHA-1: e019f794d343961d41a8d8eee5bde7b0d2e11c6c SHA-256: cb3a4a35ea28be5f0fb60b7008d9ef2ff2579f14e02ada11e2a4b1e24620f0ff
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the intent to trick the user into downloading a malicious file. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alphasigmaoverseas.com/userfiles/file/43346726266.pdf
    • http://ldbell1965.net/clients/85689/File/fekipunukafodavaduxe.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/155df4d60959bf9878b217fa69a89807/nonixinefelefo.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac651f1fe48---50493890826.pdf
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/widaxa.pdf
    • https://telenovella-bg.com/files/laxifomekubevajezi.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cijc1mc5iv6hc4688q6aoer4hb/mujajuperirakifajapajowop.pdf
    • http://sl-light.ru/design/img/upload/file/sapegatepezumusi.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2efaedbc---15352033720.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b481201972---32468675461.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f81de1a83---visosi.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/88572654484.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sfc3hekjbmncqh026qi4ele865/mafojinitekametudov.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/496c0a33449c718cd255019dcfe34bd7/28256888290.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a94927f00081053c6b60794c7dbbadc0/juvobomoz.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da12d000b7---forirojovax.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c61b119f---jirizerowiso.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077253b0f28d---24899201938.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/giteruzub.pdf
    • https://ph2020.org/FCKeditor/file/47822023610.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/sukavepofipo.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb77c81d62---12916254568.pdf
    • http://akcjonariusz.com/UserFiles/file/kujewutubarabi.pdf
    • https://protradingindia.net/userfiles/file/54645404310.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1b0f799f22be78b7f3cabf41e5ff1e44/43432423111.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1359f750---18051399659.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=isaimini+movies+2018+download
    • 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_off0000f579.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 16792 bytes
font_01_sfnt_off00010d90.bin
e705d65d43c941563890c7cb4201fb05cf3ae4ec4287306128005631b281db04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 10816 bytes
font_02_sfnt_off00012693.bin
78b6d1ec6e72d8e5f37b78dc79aac628648ab83f2bfea900d201b4b421945356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12693 17108 bytes

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