Malicious PDF — malware analysis report

Static analysis result for SHA-256 9136d01fe1becc85…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 20:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10794716120e5811b1dcf377ae306735 SHA-1: 94532cbfb1bc072b54919e5d824ebbcf7546400c SHA-256: 9136d01fe1becc8509513d9bba7684f13b6e0a8a6bc76b7840a6fe4c8059b3e1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous compromised websites, many of which are hosted on WordPress installations using the 'formcraft' plugin. The presence of these links suggests an intent to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4036e5066---99924224173.pdf In PDF document text
    • https://mannoorpally.com/uploads/file/72168020574.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/xifawokefutevanogedup.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/94960588652.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/darenisotuz.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/topiwosozejifavofi.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/paxenoxeguveb.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142138e386e1---29333871164.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/kezilosolerumovoze.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/tatuseboxaxamopo.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/39406874357.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909201633.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/36403390214.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/12945891167.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/89060385813.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/jiparaluleninidutiv.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/pikanalola.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/sekinifiragusixuselati.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/duvivisusunurerid.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/gunonivamunilenugosexesar.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/liwapunimewizuzid.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/27284152853.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/28217398761.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/delokudarajaxuxepam.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df25c554ea---27603019512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=china+android+mobile+price+in+pakistanPDF 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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 11040 bytes
SHA-256: abe82f4313f940b41bba6d1b27a7f1349c206a1ccb9a0422b60e5a5d80a112f5
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 17796 bytes
SHA-256: 1ad34cd1d74cf0c06e9d1505387b74b0a71b584b03d21d58e2dbe216d74fad93

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