Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19b9edfff54be0d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 03:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aedb312fc0e092e32b142261f3f181cf SHA-1: c2a93758d89b1e938d7f68651f32b9affbe48ba5 SHA-256: e19b9edfff54be0db4bcb114ae2b545569d5d07698b32a2ed20fd08361dd8002
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cdmvt.cz/sites/default/files/lilibizizibuwivafafatax.pdf In PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/88047570361.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160770dc860384---86773431116.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/buwenapinifufomuxu.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9f14bde91e62c087b2c8911668672f71/45351201945.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zadubuwiwejuxumivarukuva.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca437a9b3---18485301110.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/kobejenex.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cd4d37b---51453228610.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/97349679643.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/fiwopevifop.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/83106075344.pdfIn PDF document text
    • https://parkettworld.com/upload/files/24061287363.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64f02562d3---zopidezexexafalogizivu.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/60749966080.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/remugofiwino.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/53225805610.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/93770372772.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/bumikasuvisilizokemopuku.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/41220261249.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/7426653903.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ias96vdd760c627s72fum3r6i8/bafakafuvibisevagefomigeb.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/xovemirijug.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/famum.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607acaf648a0e---28298460630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=applied+linear+regression+models+pdf+kutnerPDF 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 17736 bytes
SHA-256: eb4cf1356ef3be7571e132c87224410358d5e6b0203b905538f4d842d22f0f62
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 11012 bytes
SHA-256: 9a24d242225514bfb882b65a14583ada58062047bc7aea9a72728d873ebadf77

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