Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38ab7ba1ae6fe3b…

MALICIOUS

PDF

68.1 KB Created: 2021-09-10 17:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4154d2bd99e0bd8932866c92fc40ecb1 SHA-1: 7363e237005f464bc295098f018b57ade299ffeb SHA-256: b38ab7ba1ae6fe3ba19e149f26f1c066040bf2e31cc7304ec72841d12638c5bb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns. It contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate the download of a secondary payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 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.
  • 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://clerus.hu/files/file/72179001877.pdf In PDF document text
    • https://malashealthcare.com/userfiles/files/62773475014.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/66986788574.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/7318656382.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xudisumalivizaleti.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/51040987447.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/5069170478.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210906190110_1840511359.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sivupopubimawujoforunezuw.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/woberumori.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/40183436891.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/922631694613034511cebc.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/16151512864.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139059be48eb---58105826913.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/zobetame.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/puviwigotuwidu.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906020246.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9aea508c43bc357550e8afbc6a581a95/sinomez.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/tosujusimew.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/50914904484.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d9a78b4678153e2b153a21b554bee87f/vosideneti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+event+scheduler+reminder+applicationPDF 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_off0000aea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA7 14216 bytes
SHA-256: b2143a13c32cf5eb8d45c2398e683bfe8cd5bc4838e0dc4b584874762b7d1cf0
font_01_sfnt_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 10924 bytes
SHA-256: 6d31e020f4754d2307e80cc72c43119c97ef8d3f17a8b473de83ae5858e43654

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