Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e32f91e8ae2107c…

MALICIOUS

PDF

67.6 KB Created: 2021-09-28 18:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77bb25f3938a451a80e285dbe034cc03 SHA-1: 080be4d247a42fe13a772be870a4c8dd61b3ec07 SHA-256: 4e32f91e8ae2107cb162c00441e8256d2744199acce8e6795d2d4485d1e2bdb7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into clicking links that lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://architectureanddesign.it/userfiles/files/biwiz.pdf In PDF document text
    • http://vektorma.ru/uploads/assets/file/50463732640.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/tufivudasirorovogu.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210917083640.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/26077213033.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b79db68e---15123229733.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/zodulotagufeliforobomirew.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/xilonabodumudoniji.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/87335455674.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5b09bf83---sagimagabedof.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/21849825898.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/renapelorexoparulanomatar.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/63887231057.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16152ea5b0b0c4---88604606680.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/fadilijekaruwe.pdfIn PDF document text
    • http://biomehl.com/images/content/files/3705487195.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/zuxavexilojawad.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/4594919830.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/vonaneveruruwolazuberosek.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/tudil.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/zikupukizufogazizakoked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=happy+wheels+download+pc+latest+versionPDF 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_off0000aad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD2 14144 bytes
SHA-256: 766dfca4965cd4bf6f483a59d6c3b3f88c79d185644f1f79fe2e485094b1964d
font_01_sfnt_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 10868 bytes
SHA-256: 3695c14ad1875e462407f169667f97326c86bdd7942c04d99c18cff48194ee12
font_02_sfnt_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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