Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1137b1b08be20ec…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 18:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fef894b58bc5faee22a4977603b6ea39 SHA-1: 915a83335b555adb6b8836c706f3d97f59d3a5f1 SHA-256: e1137b1b08be20ec6caf94ea004b2d5e1420260c5d82bd20313765433d4213f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of a link to a compromised WordPress upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://branchennachweis.eu/userfiles/file/40643188346.pdf In PDF document text
    • http://lasermedia.cn/userfiles/file/40742750011.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/dazogozisegopus.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/kafomusofavufukaw.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/nibetatekekujot.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/mirusifoz.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/67605454207.pdfIn PDF document text
    • https://seikai.jp/free_images/files/32825926187.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f252d3fb45---45696520747.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/11/file/20210911_160039_162.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/befolokepivasadodaxu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4814dd49---80886216806.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/44105446377.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-17/20210917200821788364.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/74529942410.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/99875312126.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/49342753082.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tajogaxok.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210916132004.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/wiradawokotuminoseku.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/51396634414.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9f262be6---rarajupipurimidafinoj.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904025459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=panda+vpn+pro+apk+download+freePDF 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_off0000cccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCC 10376 bytes
SHA-256: 17d2ea21855dcff92d15b0ad275e722838200cf6d428448fe2f881deea5bbb7d
font_01_sfnt_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 18880 bytes
SHA-256: e518163bb51aea7348a9f3b073d2b7bba41f06032b505a57de121a80708f5353