Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dd6e4115148fc1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 09:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c412ce26863f7ca38409b0daf065f802 SHA-1: 95ebf498417052babbc056efb8fdc2b174db9367 SHA-256: a5dd6e4115148fc1a8d16900f67c7d0b171e5ea888b2d73740f06a0a0b3a03c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://poaglasses.com/uploads/files/202109041210428789.pdf In PDF document text
    • https://angem.fr/userfiles/file/tolitexizefalurarek.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/19600300135.pdfIn PDF document text
    • http://showpelec.com/data/file/20210912_065120_649.pdfIn PDF document text
    • https://ms01bet.net/contents/files/68902684464.pdfIn PDF document text
    • https://angkalaris.com/contents/files/89032905505.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d87c955366adbe4a2eb50c827656b6b3/liweketaxopajusedotixofi.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/xewimiguramesolagije.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/xoxizemomenarako.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/xopexebisuzefopogekaje.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2hg419jc817gvfscnndgdfpeks/xinozemibavamiwofemodof.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0daea72d000499fcc2b8cce8dec9b02d/varefaleme.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/14777063668.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/tezajitekidifonodalebinaw.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1666813584f3d6e8bed47194fc777ad4/17268281698.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/muwipugogevelugekusupe.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/80099229761.pdfIn PDF document text
    • http://klpa.net/userData/board/file/61539867873.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/3618953555.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/xudopuninetejiguzotowine.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/57796460351.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/33127923144.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/vavufujuv.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/36713903968.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xurudesufafedaki.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e31d97b1e---24448160002.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/87031904068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=add+multiple+photos+to+one+instagram+story+androidPDF 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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 11032 bytes
SHA-256: c12e64fac6f6ffb33f800beca4112142cf60fb1a5ea717bbab2ff1be79441284
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 17816 bytes
SHA-256: dcea61e633bf7e2f9750b5f78811b3e9926df43bcd8d6e9aef1f5b8a5cb10c81
font_02_sfnt_off000127c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1