Malicious PDF — malware analysis report

Static analysis result for SHA-256 f507b1140db125e4…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 00:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b9b5f5732f361647b33fc11a21fe1ad SHA-1: 8641959312aad3acf0b288c775fdd8dd357d8912 SHA-256: f507b1140db125e4fc5e3e519efb622aa38d17333e37a0e2949f43a206f215de
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to phishing or malware sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe789a5bef---12587915590.pdf In PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/fewotemuvamatid.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/e3iacqkdmboius3qooa5horocg/jiwamemawekakukefuw.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0221c64efd1515f9beab285ff8f81390/4908411439.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/b9681cb344db95b73ff42700d1c1692d/sitelavogerepi.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/bidituwiwexivirisumow.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xumesivusotamuvavizunogen.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/nefafaraxo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf701d5832---32845264597.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-8-3/20210803060125147497.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/58221017873.pdfIn PDF document text
    • http://stisk.com/file/rutenoxaxifa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a612f42ef10---bewipewipaxugagazarefoj.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc11a6c931---luzix.pdfIn PDF document text
    • http://vce34.ru/attachments/file/rokifakavadam.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/zobexaxeriwudemelere.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd7f268698---59993590258.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sidilogo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d00836fb936cbaa75c78c61ac5b35da/zegosorelofomozedilim.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/xovof.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/lovuvop.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/71795770503.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/22405228434.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9539b9799da07512213025f95a87e342/55919431304.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/jubiwodizegenuwoxefapu.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/75759742134.pdfIn PDF document text
    • https://haidangpc.com/contents/files/92862274763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=seed+dispersal+worksheets+grade+6PDF 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_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 19188 bytes
SHA-256: 3579253354b9c0579b58ee5c3171eef168d34591b1b2c9fc968d6b6066bee4a6
font_01_sfnt_off00012607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 10988 bytes
SHA-256: d9d925d4c439456280470986e36e584e25e5a5da1176682173f5e090d6cd89d0
font_02_sfnt_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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