Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8085dc4a91a981…

MALICIOUS

PDF

106.8 KB Created: 2021-10-04 18:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a4571cf3784e111fdf5c81125687ad2 SHA-1: b5003499f89bf99d5b2885bfa7a2dbdf84b8e34f SHA-256: ce8085dc4a91a98120e34124e309903c5fa6df00b90adab8dbc5da510c5d54c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised CMS uploads, suggesting a link farm for malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=sand+empires+and+puzzles PDF link annotation
    • http://www.benyowsky.com/resources/files/gimomirotovowix.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/63dea50f7b905a6b3c1c5b7b64ae283c/31442729992.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092905422099.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/furagaguluzewasek.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/rubawezufafavub.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/5039949542.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/widazoriniv.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/16771041113.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/dupusibavop.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/jawuroradixaj.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/31940181740.pdfIn PDF document text
    • http://wernitznigg.at/files/712890562.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/temexuwoxu.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/lobufulijapajokuvupula.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161431414a5676---69369308920.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615226e38421e---29765970213.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/kitimepumepadepetuxudu.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/devogebugomotuzemep.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161488361a5f91---nimupezoputawulevu.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/nupizipowuf.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/konarozupadev.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe12735ae9---76907609884.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210911201632.pdfIn PDF document text
    • 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_off000136fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F15 10568 bytes
SHA-256: c274e2ccc6025364e9faf459db16414fc0364157a6777ff1829ba8358ddc19d1
font_02_sfnt_off00016713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16713 20984 bytes
SHA-256: 08c1b010a80d47cb657cee5349d212fb5f3c4f58cefbe9e27323575e67f16b9e

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