Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa27b6fb4c3dffb2…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 22:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d785f75f6a2a91afd744f38503e3ba4 SHA-1: 8029eb27caf6877d445aaa7180e3fff805199f49 SHA-256: fa27b6fb4c3dffb27f1b4e4579017382ccedc0444d5a22e7e77ae7b0faf3fdcc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many hosted on compromised CMS uploads or disposable domains, strongly suggests a phishing or redirection campaign. The document's small size and image-heavy appearance further support its use as a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 2 text block(s), carries a click-outward action, and is only 71 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 https://drosamahetta.com/userfiles/file/perewatijonejefu.pdf In PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/fupumezitofako.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210922_022357.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/napunuwa.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ebaddebbb99aabd242885818032128b1/66064774818.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210916_160130.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/dobisubunixurulikewuvo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613432a47618b---45787939151.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac75c6a54---numarafoxuzunilaxuvulipi.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210921015308_582367823.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/nodogidivelojilir.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/beguvogevelewev.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/3973405453.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowiweg.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/viregusiwefapizepamisulum.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tjviq6p15hdi7b712352h34mtv/kelonerekutaturofa.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/1988392609.pdfIn PDF document text
    • http://parentini.it/userfiles/files/65838299390.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lirabugej.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1beb531f2---44302943724.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/ketosalenepodo.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/rorudetinatifolaguv.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/86664303163.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/gisanukabijedevipujit.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18623918151.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210922185955874190wvccp.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=star+wars+galaxy+of+heroes+mod+apk+unlimited+money+downloadPDF 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_off0000b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 14544 bytes
SHA-256: c7c0f595895b51c1e8d5ed9abb18dc6a1c6dc3b5ab7aece1dc929f0485b2d2ce
font_01_sfnt_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 11512 bytes
SHA-256: 7279311c37fb08178e3737c87898a8ce1efc315fb40fbd29ac50703988e84b9d

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