Malicious PDF — malware analysis report

Static analysis result for SHA-256 033d7072d96e595c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 09:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c266da8e007ab1a9ee23e276324daee SHA-1: a3308c8a75e993eddec3c697e374ca00c37b920b SHA-256: 033d7072d96e595c549f566db2fee51280b34b548b2ef7f33483ebf1292f946b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external links, including those hosted on compromised WordPress sites, suggests a phishing or credential harvesting attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nitecoreromania.ro/files/file/janeja.pdf In PDF document text
    • http://sudeoksa.com/userfiles/file/20210905083458.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/notagesiluruxagi.pdfIn PDF document text
    • http://mutitar.com/user_img/files/narugukiluvaxul.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/tedoxekuluwigavunalojo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9700ae44a4d93236f32faf11620a279a/29436153340.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/noremitepenakotog.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bb5a6d1c2670950b87c80b897b392514/64553191465.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/juzalemisexale.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/zuxivukidegamegurek.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/lanujepufisosijepix.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///gabik.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/14328470509.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/pijan.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/kaxakufatikoso.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/koxeme.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64e7429eb---82212741416.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0ee92f3c07e889463076f8666c7da1ad/5120069109.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/54671770300.pdfIn PDF document text
    • http://agmapure.com/upload/files/mexibufepatugevine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+transfer+files+from+laptop+to+android+phone+wirelesslyPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/lotevovutusesawafolasiko.pdfIn PDF document text
    • 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_off0000ba96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA96 10952 bytes
SHA-256: 297a7d7881ad80521a0e3c503cedff37a76040fc2e2923b15f4bc586ffee3212
font_01_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 16188 bytes
SHA-256: 8587e4c4794b11196d6ee4791560166f7d5931c0bc7ba23814a3f8371e3dd4bc
font_02_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1