Malicious PDF — malware analysis report

Static analysis result for SHA-256 749fd52d48390d1f…

MALICIOUS

PDF

87.0 KB Created: 2021-07-23 17:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f43822779e699143de6ffbbe4c291996 SHA-1: 61381391f95244588b9577fb26267bb5bd150c2a SHA-256: 749fd52d48390d1ffbdca0e3afc8d751e1515b870c03aba311d9983e3164cd0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute or host malicious content. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic indicate a likely intent to redirect users to malicious sites or download further payloads, possibly via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cbec3dac10d062301271a25f8477c992/busifa.pdf In PDF document text
    • https://atphp.ch/userfiles/file/feliju.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/af06e37acc60c39214e96f966b53c10c/64160357264.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/merusejejifaxivamobad.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/66352524437.pdfIn PDF document text
    • http://www.heksan.com.pl/file/90594683920.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160952b5b08074---figipetijamipovileliw.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/61775481082.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be8ff8b0a9---33078354209.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/95d4f88911db04843cf408f9bc6d32d0/85967521267.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e67efa2666---sepum.pdfIn PDF document text
    • http://millecolori.it/images/file/63596743527.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dcci1lgkk8p63plj435bb7g949/44659569947.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c549ef412ef2e5271f38c479a9fc53d1/45627004863.pdfIn PDF document text
    • https://geniodelweb.com/file/82936905473.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a27af3c1712---807167027.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21783ccbd---lakatimonabaxekin.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/93781666261.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39b007f64---jalafom.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/16814324822.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0cae6253b4368a0d46cac53c5a7d977a/11826548439.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723c1c4f1e8---80387665921.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3198q0ctae6p6lifaspp1lcebi/32411517700.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/7183556505.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/30686175165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pirates+of+the+caribbean+theme+song+lyrics+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_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 11264 bytes
SHA-256: aa389fa202e3663b6d939b72ca3dcc2aa557d4655c725db79df4a5e3aefb5364
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 17648 bytes
SHA-256: c57fad0f3ad4057802f5d6eb25e144b1e10356fb5fbeae03056db2d9dc7e623d