Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8d07f35e8a02a0…

MALICIOUS

PDF

76.7 KB Created: 2021-09-11 22:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fabafed3394d38c6c27211ce1271d2c9 SHA-1: 6c09c48e0491d37acf7947a1c5b99aaccf75734a SHA-256: 7d8d07f35e8a02a0d1a37d9d77224959c0189766cb232b5f4dd6070cf3c4cf2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to manipulate search results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://minhvuongthuphap.com/upload/ck/files/pozifubenagej.pdf In PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/82124380370.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b857ef52---mezodiruvafutulumuram.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac25e8bb1---64765162468.pdfIn PDF document text
    • http://artediapharma.com/upload/files/27534523771.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/xanataliluzuzikenemir.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/42089796378.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613293292ed49---budipobedevevu.pdfIn PDF document text
    • http://metapolar.hu/tmp/56519922374.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/xudiweletatasozavedafefi.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/wuropepedovifejat.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109011131054919.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/27411119673.pdfIn PDF document text
    • http://thevalleytrader.com/files/19588742154.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/30545673490.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/73372949377.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/roroxezebisaw.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/78628467978.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/63528290866.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/80254648512.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/84713892912.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/76123743490.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210902050746.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/5855373731.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wovajafegutobaka.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/76832667145.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/32069637552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mafia+crime+war+apkPDF 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_off0000c7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 10276 bytes
SHA-256: a2407e77ea670eacf6686be57e47b9c6f1a37f8cf9050de9971db2d3b75137b4
font_01_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 17712 bytes
SHA-256: 4455ba2d0cb1bcbb368df7b88be7af29e49a4d89e3b5ba0e0dae6743bce585a6

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