Malicious PDF — malware analysis report

Static analysis result for SHA-256 9758c4bd9847ff0e…

MALICIOUS

PDF

68.3 KB Created: 2021-09-12 11:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c188e33b3783951122c773058ea2047 SHA-1: 3bbca1df31b111119c492ec5ffe972fcaa6611e2 SHA-256: 9758c4bd9847ff0e2559612b97ca26a0b6646f174bf1c550ab597ba5d1a4dabf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It employs an image-only lure with a click-outward action, typical of phishing campaigns aiming to redirect users to malicious sites. The embedded JavaScript stream and numerous external URIs, including links to compromised CMS uploads and disposable hosting, further support this assessment. The primary goal appears to be redirecting users to potentially malicious content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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 0 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.
  • 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://orenprom.com/img/account/file/daresifezelolapijotoxa.pdf In PDF document text
    • http://www.pilatesyoga.hr/files/files/bunugukuxero.pdfIn PDF document text
    • http://vaynhe.com/upload/files/guxisabutonubavadelujosuz.pdfIn PDF document text
    • http://wirheiraten.de/images/file/salojajusa.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/98277034644.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/5ou97ufotj9ctd7oerehgabkfr/mapowemivovekaf.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/fodiwoxo.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/vepewiwoxenasanawololukif.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///48396700217.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/vunesenubejugam.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161327ddde586a---vidoxozibiwe.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1b5f072ef330f27146dde7a48ef41b4f/928815917.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4364aa5b---nagut.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/xonetaturovewero.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/39425038747.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1f82999082bea63dc495bd6658500b0a/felodoxegobazoziluko.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/fonibozogagarijudegom.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/pomipaxenojixitogedozotuj.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/76171442640.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/25472052566.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-10/20210910192654271318.pdfIn PDF document text
    • http://warehousetraining.ie/images/dazulam.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/79226116292.pdfIn PDF document text
    • https://majubesar.org/contents/files/66177625283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+does+the+composter+do+in+minecraftPDF 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_off0000b017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB017 10832 bytes
SHA-256: 5315166ee2a0a7bb6015a0d814951af939d72db16e23fba5b150bc983fd96f1b
font_01_sfnt_off0000c8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 13924 bytes
SHA-256: 96f7256189001f0024a84337e15e6324380cabe9a5cd483812f0b1f690884841
font_02_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1